1. subject+verb disagreement (has instead of have) disqualifies B, D
2. C, E changes the subject itself: "curved objects made for throwing boomerangs" indicate that we aren't talking about boomerangs but some device used for throwing boomerangs.

This leaves us with "A", which though not ideal, qualifies as the best choice.

Thanks, that sounds coherent!

Post comma i see when--this forces me to check out answer choices which end time period.

Am i right in applying this logic?

IMO A


B
object / their is incorrect

C
have called from when...........incorrect

DE
from when is incorrect
D is passive

aj5105 wrote:Post comma i see when--this forces me to check out answer choices which end time period.

Am i right in applying this logic?

Yes

stop@800 wrote:

aj5105 wrote:Post comma i see when--this forces me to check out answer choices which end time period.

Am i right in applying this logic?

Yes

thanks.

IMO: A

The end of the sentence (after the underlined portion) begins with a time modifier "when...". Therefore the underlined portion should end with a time. Eliminate everything but A & B.

B is problematic because it uses the plural pronoun 'their' to refer to the singular antecedent 'any object'. A which talks about 'all objects' is better.

Pick A. A more detailed explanation can be found at GMATPrep Question 2151. If you struggle with similar questions, practice by setting topic='SC Pronouns & SC Modfiers' and difficulty='600-700 & 700+' in the Drill Generator.

Good luck,
-Patrick

PS: This question is also discussed at https://www.beatthegmat.com/aerodynamic- ... 61803.html

erdnah wrote:Regardless of their form or function, all aerodynamicall enhanced, curved objects made for throwing have been called boomerangs by non-Australiens ever since 1788, when Europeans saw Dharug-speaking men tossin "bumariny" in the area later known as Sydney.

• (A) Regardless of their form or function, all aerodynamicall enhanced, curved objects made for throwing have been called boomerangs by non-Australiens ever since 1788,
  (B) Regardless of their form or function, any aerodynamically enhanced, curved object made for throwing has been called a boomerang by non-Australians ever since 1788,
  (C) Ever since 1788, non-Australians have called all aerodynamically enhanced, curved objects made for throwing boomerangs, regardless of their form or function, from
  (D) Ever since 1788, any aerodynamically enhanced, curved object made fro throwing has been called a boomerang by non-Australians, regardless of its form or function, from
  (E) Non-Australians have called all aerodynamically enhanced, curved objects made for throwing boomerangs ever since 1788, regardless of their form or function, from

Is "from when" wordy/awkward or redundant?

Can you explain why the official answer is A?

This is how I went about it . May also help you . If the look at the later part of the sentence which is correct , it starts with "when Europeans saw ....... ". The "when" surely refer to a time/timeperiod. So the "to be" corrected part of the sentence has to end with 1788 .

"....... 1788, when Europeans saw .......

So, either A and B can only be correct .

Let's look at B because A is just a repetition of the question

(B) Regardless of their form or function, any aerodynamically enhanced, curved object made for throwing has been called a boomerang by non-Australians ever since 1788,

The plural pronoun cannot refer to singular object boomerang

Hence A is correct