For collective noun in gmat(American English) singular is used. hence it is used

what is meant by collective noun?

collective nouns are nouns which are used to represent a group
eg army,flock,herd etc

Posted from my mobile device

Between c and d ( considering collective pronoun s are singular) , had been is incorrect for c, simple past to present comparison is correct, so D

Biologists is plural noun and they referred here for Biologists. I think correct answer should be B

Dear Experts!!

Could you please help with the detail solution for this?

d.it was eradicated for centuries and remains an endangered and much-maligned species

here "Was eradicated and remains aren't parallel" please explain.

Thanks in advance

Hello, sanjibh062. It cannot be the case that they refers to biologists, since that would mean that biologists, not wolves, have been eradicated for centuries. I mean, I have heard of dark ages for science, but nowhere have I read about people burning biologists at the stake or anything, let alone wiping out every last biologist in the vicinity. No, the non-underlined subject of the main clause, the wolf, in addition to the singular verb agreement in has, cues us in on the singular subject of the sentence, and only the pronoun it can serve in place of the wolf. To be honest, I wish the question were reformatted with the correct underlining in the original sentence, as I feel that would aid members considerably.

Bunuel , will you please update the question? Thank you.

- Andrew

_______________________
Done. Thank you.
_________________

HI Rishit,

in D there is perfect parallelism,

It was eradicated for centuries || It remains an endangered and much-maligned species


DM if you have any queries.I would love to help

Kaplan's Explanation -

Read the Original Sentence Carefully, Looking for Errors:
When the underlined portion of the sentence contains a pronoun, check to make sure the pronoun agrees in number with the noun it is referring to.
Here, the underlined portion starts with the pronoun "they," which is referring to "the wolf."
Since "the wolf" is singular, it requires a singular pronoun. "They" is plural, however, and so is incorrect.
The sentence also uses the present progressive verb "are being eradicated" to describe an action that has taken place "for centuries," meaning it has happened in the past. This is also an error.
Scan and Group the Answer Choices:
(A) and (B) contain the incorrect plural pronoun "they."
(C), (D), and (E) change the pronoun to "it" or "its."
Eliminate Wrong Answer Choices:
Based on the error spotted during the initial reading of the sentence, (A) and (B) can be eliminated. They both use the wrong pronoun.
(C) corrects the pronoun error by changing "they" to "it." However, the past perfect verb tense, "had been eradicated" and "had been much maligned," is overly complicated and changes the meaning of the sentence, which states the wolf is maligned today. Eliminate (C). (E) is wrong because it ends up creating a clause beginning with "although" that does not include a verb. Dependent clauses beginning with "although" must contain a subject and verb. Here's an example: Although Jim is quiet, he is not shy. (D) corrects the pronoun error by using "it" and changes "they are being " to the simple past tense "it was," which works perfectly. (D) is correct.
TAKEAWAY: Pronouns are often tested. Stick to the rules—pronouns must have clear antecedents and agree in number with their antecedent—and watch out for answer choices that fix the pronoun error but introduce new errors.