Question I'm writing for interactive GMAT site--Magoosh

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I'm writing a series of verbal questions for the interactive GMAT site, Magoosh, which will go live next month for the verbal section. Currently, I'm writing SC questions that I hope are at the 700+ level. Any feedback would be appreciated. Thanks!



Metamorphic rocks form when a protolith, which can come in the form of an igneous, sedimentary, or a previous metamorphic rock, is subjected to intense pressure and heat, sometimes in excess of 200 degrees Celsius.

(A) Metamorphic rocks form when a protolith, which can come in the form of an igneous, sedimentary, or a previous metamorphic rock, is subjected to intense pressure and heat, with temperatures exceeding 200 degrees Celsius.
(B) A protolith, which forms from igneous, sedimentary, or previous metamorphic rocks, when subjected to intense pressure and temperatures exceeding 200 degrees Celsius becomes a metamorphic rock.
(C) Metamorphic rocks result when a protolith, which can be an igneous, sedimentary, or previous metamorphic rock, is subjected to intense pressure and heat, a process in which temperatures can be in excess of 200 degrees Celsius.
(D) Metamorphic rocks result when a protolith, which can be igneous, sedimentary, or previous metamorphic rocks, is subjected to intense pressure and heat, sometimes in excess of 200 degrees Celsius.
(E) Forming from igneous, sedimentary, or previous metamorphic rock, a protolith is subjected to intense pressure and heat—sometimes in excess of 200 Celsius—to become a metamorphic rock.
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Source: — Sentence Correction |

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by p2pg » Wed Jun 17, 2009 9:36 am
Is it D

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by pratikgandhi » Wed Jun 17, 2009 9:43 am
Metamorphic rocks form when a protolith, which can come in the form of an igneous, sedimentary, or a previous metamorphic rock, is subjected to intense pressure and heat, sometimes in excess of 200 degrees Celsius.

(A) Metamorphic rocks form when a protolith, which can come in the form of an igneous, sedimentary, or a previous metamorphic rock, is subjected to intense pressure and heat, with temperatures exceeding 200 degrees Celsius.
(B) A protolith, which forms from igneous, sedimentary, or previous metamorphic rocks, when subjected to intense pressure and temperatures exceeding 200 degrees Celsius becomes a metamorphic rock.
(C) Metamorphic rocks result when a protolith, which can be an igneous, sedimentary, or previous metamorphic rock, is subjected to intense pressure and heat, a process in which temperatures can be in excess of 200 degrees Celsius.
(D) Metamorphic rocks result when a protolith, which can be igneous, sedimentary, or previous metamorphic rocks, is subjected to intense pressure and heat, sometimes in excess of 200 degrees Celsius.
(E) Forming from igneous, sedimentary, or previous metamorphic rock, a protolith is subjected to intense pressure and heat—sometimes in excess of 200 Celsius—to become a metamorphic rock.

Its between B and E. Though I can't see an error in E, B sounds good. IMO B
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by anksgupta » Wed Jun 17, 2009 9:52 am
IMO A. Tough Q indeed. Dont hav much clues

B - changing the meaning. It seems when igneous, sedimentary, or previous metamorphic rocks are subjected to pressure and heat, then a protolith is formed

C- Can be cannot be used here, as 200 degree celsius is a required condition

D- 200 degree should be explicitly modify temperature(not present) or should be present with heat, not pressure and heat both

E same as D

Whats the OA
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by commit.gmat » Wed Jun 17, 2009 9:56 am
IMO D.

I eliminated B, C and E and chose between A and D.

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by pratikgandhi » Wed Jun 17, 2009 10:05 am
Option A and the question do not match :)
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by dendude » Wed Jun 17, 2009 10:49 am
I'd choose the original sentence.
Note, I'm not saying A because its NOT the original sentence.

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by pratikgandhi » Thu Jun 18, 2009 12:39 am
dendude wrote:I'd choose the original sentence.
Note, I'm not saying A because its NOT the original sentence.
What does "in excess of 200 F " in the original sentence modify. This cannot be used for heat. So original sentence is wrong anyways..

Although B changes the meaning but seems to be the most suitable
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My mistake-- Correct version reposted.

by Clele75 » Mon Jun 22, 2009 8:40 am
This question was flawed from the beginning with the mismatch between the underlined part and (A). Below is the corrected version. Nobody chose the correct answer, so let's try this one more time. I'll post the answer with explanations after I get a few replies.



Metamorphic rocks form when a protolith, which can come in the form of an igneous, sedimentary, or a previous metamorphic rock, is subjected to intense pressure and heat, sometimes in excess of 200 degrees Celsius.

(A) Metamorphic rocks form when a protolith, which can come in the form of an igneous, sedimentary, or a previous metamorphic rock, is subjected to intense pressure and heat, sometimes in excess of 200 degrees Celsius.
(B) A protolith, which forms from igneous, sedimentary, or previous metamorphic rocks, when subjected to intense pressure and temperatures exceeding 200 degrees Celsius becomes a metamorphic rock.
(C) Metamorphic rocks result when a protolith, which can be an igneous, sedimentary, or previous metamorphic rock, is subjected to intense pressure and heat, a process in which temperatures can exceed 200 degrees Celsius.
(D) Metamorphic rocks result when a protolith, which can be igneous, sedimentary, or previous metamorphic rocks, is subjected to intense pressure and heat, sometimes in excess of 200 degrees Celsius.
(E) Forming from igneous, sedimentary, or previous metamorphic rock, a protolith is subjected to intense pressure and heat—sometimes in excess of 200 Celsius—to become a metamorphic rock.
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by pratikgandhi » Mon Jun 22, 2009 9:05 am
C??
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by Domnu » Mon Jun 22, 2009 10:10 am
I would go with B.

Here's why:

Eliminate A, D, and E since "in excess of 200 degrees Celsius" is unidiomatic. With B and C, choice C seems to suggest that the "process" of intense heat and pressure involves "temperatures can exceed 200 degrees Celsius," which is awkward; intense heat and pressure isn't a process, and there is no prerequisite for such a "process" to involve temperatures exceeding 200 degrees Celsius.
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by necromancer_678 » Thu Jun 25, 2009 7:47 am
i will go with B as well...
looks the most apt

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by yeloaw » Thu Jun 25, 2009 9:46 am
IMO E

Metamorphic rocks form when a protolith, which can come in the form of an igneous, sedimentary, or a previous metamorphic rock, is subjected to intense pressure and heat, sometimes in excess of 200 degrees Celsius.

(A) Metamorphic rocks form when a protolith, which can come in the form of an igneous, sedimentary, or a previous metamorphic rock, is subjected to intense pressure and heat, with temperatures exceeding 200 degrees Celsius.
(B) A protolith, which forms from igneous, sedimentary, or previous metamorphic rocks, when subjected to intense pressure and temperatures exceeding 200 degrees Celsius becomes a metamorphic rock. Meaning changed
(C) Metamorphic rocks result when a protolith, which can be an igneous, sedimentary, or previous metamorphic rock, is subjected to intense pressure and heat, a process in which temperatures can be in excess of 200 degrees Celsius.
(D) Metamorphic rocks result when a protolith, which can be igneous, sedimentary, or previous metamorphic rocks, is subjected to intense pressure and heat, sometimes in excess of 200 degrees Celsius. Awkward construction
(E) Forming from igneous, sedimentary, or previous metamorphic rock, a protolith is subjected to intense pressure and heat—sometimes in excess of 200 Celsius—to become a metamorphic rock.

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by geet » Thu Jun 25, 2009 10:48 am
B is wrong because it changes the meaning

C is the best option!

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