s_raizada wrote:netigen,
A is correct

monkfish is a collective noun and in this conext it is used as plural

https://dictionary.reference.com/browse/monkfish

Thier is referring to monkfish because it is the nearest noun. The grammar definition of pronoun usage says 'pronoun referes to nearest reasonable noun'

The link above suggests that MONKFISH is Plural ( in general FISH is plural)

....what about the word DATA ? InGMAT land if we encounter a sentence having DATA -- will it be singular or plural
I believe DATUM (singular of DATA) is seldom used today !!

isnt there a modifier problem in A?

Correct Option:- There are no legal limits, as there are for cod and haddock, on the size of monkfish that can be caught, a circumstance that contributes to their depletion through overfishing.

There are no legal limits on the size of monkfish that can be caught, unlike cod or haddock, a circumstance that contributes to depleting them because they are being overfished.
----size of monkfish compared to cod or haddock

There are legal limits on the size of cod and haddock that can be caught, but not for monkfish, which contributes to its depletion through overfishing.
----size of monkfish and hadcock compared to monkfish

Unlike cod and haddock, there are no legal size limits on catching monkfish, which contributes to its depletion by being overfished.
----Wrong comparison


Unlike catching cod and haddock, there are no legal size limits on catching monkfish,contributing to their depletion because they are overfished.
-----again wrong comparison

can unlike be used correctly in this question?

Asad Zaidi wrote:can unlike be used correctly in this question?

If the sentence were structured a bit differently from how it is, unlike could work. What's necessary is for the comparison to make sense. Regulations would have to be unlike other regulations, or fish would have to be unlike other fish.

Here's an example.

Unlike cod and haddock populations, monkfish populations are not protected via legal limits on fishing, a circumstance that contributes to ...

Thanks Marty. I think the only correct use of unlike for comparison is "Unlike A, B", where both A and B are nouns. Is that correct?

Asad Zaidi wrote:Thanks Marty. I think the only correct use of unlike for comparison is "Unlike A, B", where both A and B are nouns. Is that correct?

While if we were to think about it long enough we might find some constructions in which somehow unlike is used in a comparison that is not exactly comparing two nouns, yes, what you said is basically correct and may actually be 100% correct, especially in the context of the GMAT.

I agree, this is the best answer choice and it also provides a correct and logical comparison

netigen wrote:OA is A