Why D over C?

Expert replies

aj5105: Legendary Member; Posts: 1169; Joined: Sun Jul 06, 2008 2:34 amFollowed by: 1 member; Thanked: 25 times

by aj5105 » Sat Nov 01, 2008 12:34 am

Increases in the level of high-density lipoprotein (HDL) in the human bloodstream lower bloodstream-cholesterol levels by increasing the body’s capacity to rid itself of excess cholesterol. Levels of HDL in the bloodstream of some individuals are significantly increased by a program of regular exercise and weight reduction.
Which of the following can be correctly inferred from the statements above?
(A) Individuals who are underweight do not run any risk of developing high levels of cholesterol in the bloodstream.
(B) Individuals who do not exercise regularly have a high risk of developing high levels of cholesterol in the bloodstream late in life.
(C) Exercise and weight reduction are the most effective methods of lowering bloodstream cholesterol levels in humans.
(D) A program of regular exercise and weight reduction lowers cholesterol levels in the bloodstream of some individuals.
(E) Only regular exercise is necessary to decrease cholesterol levels in the bloodstream of individuals of average weight.

Source: Beat The GMAT — Critical Reasoning | Sat Nov 01, 2008 12:34 am

raunekk: Legendary Member; Posts: 1159; Joined: Wed Apr 16, 2008 10:35 pm; Thanked: 56 times

by raunekk » Sat Nov 01, 2008 1:52 am

except D, all options are too strong in language...

aj5105: Legendary Member; Posts: 1169; Joined: Sun Jul 06, 2008 2:34 amFollowed by: 1 member; Thanked: 25 times

by aj5105 » Sat Nov 01, 2008 2:02 am

yup,we need to consider language,so did I.
Chose C

Mani_mba: Master | Next Rank: 500 Posts; Posts: 267; Joined: Wed Jul 16, 2008 12:20 amFollowed by: 1 member; Thanked: 4 times

by Mani_mba » Sat Nov 01, 2008 6:38 am

Nowhere in the passage is mentioned that the weight reduction and exercise are the most effective methods. It just says that "Levels of HDL in the bloodstream are increased by a program of regular exercise and weight reduction" .. And that too, according to the passage, applies to "Some individuals".

Moreover, the passage does not mention any other methods to increase the levels of HDL. So (c) is definitely out of scope. (D) looks perfect.

codesnooker: Legendary Member; Posts: 543; Joined: Fri Jan 18, 2008 1:01 am; Thanked: 43 times; GMAT Score:580

by codesnooker » Sat Nov 01, 2008 8:55 am

(D) perfectly retrace the path of conditional diagram that can be made by using premises. Whereas (C) goes beyond the scope as stated by Mani in the above post.

Hence choose (D).

raunekk: Legendary Member; Posts: 1159; Joined: Wed Apr 16, 2008 10:35 pm; Thanked: 56 times

by raunekk » Sat Nov 01, 2008 9:53 am

yup,we need to consider language,so did I.
Chose C

C) Exercise and weight reduction are the most effective methods of lowering bloodstream cholesterol levels in humans

i feel C is more stronger in language than D

stop@800: Legendary Member; Posts: 871; Joined: Wed Aug 13, 2008 7:48 am; Thanked: 48 times

by stop@800 » Sat Nov 01, 2008 10:31 am

C is wrong because it says "the most effective methods"
and the question stem says
"some individuals"

www.interrogationpoint.com

aj5105: Legendary Member; Posts: 1169; Joined: Sun Jul 06, 2008 2:34 amFollowed by: 1 member; Thanked: 25 times

by aj5105 » Sun Nov 02, 2008 8:22 am

Thanks guys !

scoobydooby: Legendary Member; Posts: 1035; Joined: Wed Aug 27, 2008 10:56 pmFollowed by: 1 member; Thanked: 104 times

by scoobydooby » Sun Nov 02, 2008 11:59 pm

codesnooker wrote:(D) perfectly retrace the path of conditional diagram that can be made by using premises. Whereas (C) goes beyond the scope as stated by Mani in the above post.

Hence choose (D).

hey codesnooker,
what is this technique of conditional diagramming? could you please explain or refer the source, sounds interesting

codesnooker: Legendary Member; Posts: 543; Joined: Fri Jan 18, 2008 1:01 am; Thanked: 43 times; GMAT Score:580

by codesnooker » Mon Nov 03, 2008 11:33 am

scoobydooby wrote:
codesnooker wrote:(D) perfectly retrace the path of conditional diagram that can be made by using premises. Whereas (C) goes beyond the scope as stated by Mani in the above post.

Hence choose (D).
hey codesnooker,
what is this technique of conditional diagramming? could you please explain or refer the source, sounds interesting

Please read the chapter-6 of LSAT Powerscore CR Bible. You can find a soft copy at esnips.

It's difficult to explain in terms of text as it contains arrow and cross notations, otherwise I would have explained here only.

vanessa.m: Master | Next Rank: 500 Posts; Posts: 100; Joined: Tue Aug 05, 2014 3:58 am

by vanessa.m » Fri May 13, 2016 1:20 am

I'd say C, but I'm afraid more because of my intuition than any logic.

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