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noun clauses - SC

Sentence Correction

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.

(A) 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.

(B) 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.

© 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.

(D) Unlike cod and haddock, there are no legal size limits on catching monkfish, which contributes to its depletion by being overfished.

(E) Unlike catching cod and haddock, there are no legal size limits on catching monkfish, contributing to their depletion because they are overfished.

Correct ANS: A

请问(A)中的a circumstance是指代什么呢?legal limits吗?单复数不一样也可以这样指代吗?谢谢!

这里没有指代关系,指代是根据代词而言的,circumstance又不是代词。
这里是独立主格结构(absolute phrase),circumstance用来总结界面一句话。(复习下上课的笔记,absolute phrase我们讲过的)