The only possible correct answer choices to this problem are A and D. The idiom not X but Y requires parallelism between X and Y.

Option B is not parallel

believe that the park needs to not be redesigned(X) but to be returned. The first to needs to be after not.

Between A and D, a group of .. can be singular or plural, depending on what you want to emphasize.

If you want to emphasize on the action use the plural form. If you want to emphasize on the group use the singular form.

I think that here the correct answer choice is A because all the group believe the same thing so the author emphasizes on the group.

In this GMAT OFFICIAL problem sc-as-vs-like-76300.html

The correct answer choice uses plural because the proportion of women work in different jobs in the same industry.

Kaplan GMAT has the same exact question and they give the answer to be A. The explanation says that the subject is "group". So then, shouldn't the sentence be " A group of students who has begun......". I am confused......or I need to learn basic grammar.

Thanks Mike !! now i'm clear on why A.

OA is A

GROUP/COLLECTION is always considered sigular
"PROPORTION" is not a collective noun and hence has to be treated as plural

I guess it should be mentioned in any standard grammar book on the chapter of TENSES/
subject verb agreement..
Even manhattan sc guide has it

Wow....This really is a tricky and very good question. Here is my explanation.

A group of sudents who have begun to clean up Frederick Law Olmstead's Morning Park in New York City believes that the park needs not to be redesigned but to be returned to its former condition

Here relative phrase "A group of students who have begun to clean up" is infact referring to students.Hence plural verb form - have begun.

The intended meaning of the sentence refers to the group as a whole. In these cases,the verb shouldbe singular.

A group........believes that the park......is the correct usage.

Left with A and C.

Correct idiom is NOT X BUT Y where X and Y should be parallel.

In C, needs not to be redesigned but could , X is an infinitive. So Y should also be an infinite but not the case.

Hence ans= A.

A is correct.
Group is the subject and is singular, so B, D and E are out.
C is out because it is not paralllel.

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IMO A

a group therefore singular
eliminate B,D,E
not x, but y
eliminate C
therefore A

I think we have approached this i one of the students- plural or singular verb issue from Kaplan, or MGMAT's point of view. Have we looked at it from the GMAC’s point of view? If not, here is a question from GPrep that employs this structure and indicates GMAC’s views on it.

According to two teams of paleontologists, recent fossil discoveries in Pakistan show that whales, porpoises, and dolphins are more closely related to some of the oldest known even-toed ungulates--a group of hoofed mammals that today includes cows, camels, pigs, and hippos—than to any other mammals.
A. that whales, porpoises, and dolphins are more closely related to some of the oldest known even-toed ungulates—a group of hoofed mammals that today includes cows, camels, pigs, and hippos—than
B. that whales, porpoises, and dolphins are more closely related to some of the oldest known even-toed ungulates—a group of hoofed mammals that today include cows, camels, pigs, and hippos—as
C. whales, porpoises, and dolphins to be more closely related to some of the oldest known even-toed ungulates—a group of hoofed mammals that today include cows, camels, pigs, and hippos—than they are
D. whales, porpoises, and dolphins as being more closely related to some of the oldest known even-toed ungulates—a group of hoofed mammals that today includes cows, camels, pigs, and hippos—as they are
E. whales, porpoises, and dolphins as more closely related to some of the oldest known even-toed ungulates—a group of hoofed mammals that today include cows, camels, pigs, and hippos—than

The correct answer is choice A, containing ‘a group of hoofed mammals’ that today ‘includes’ cows, camels, pigs, and hippos’

Now you know what GMAC considers right.

Can we have some OG or GPrep example in which the GMAC has preferred the other choice?
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I picked 'believe' vs 'believes', but a group is singular.