The North American bald eagle is no longer threatened with imminent extinction, primarily on account of prohibiting hunting and the ban of a poisonous pesticide have led to a rebound in the eagle population.


(A) on account of prohibiting

(B) on account of their prohibiting

(C) because prohibitions on

(D) because of prohibiting

(E) because they prohibit


This question is based on Idiomatic Usage and Parallelism.


Options A and B lack parallelism. The participle ‘prohibiting’ is not parallel to the noun ‘ban’. Since these are the reasons that the bald eagle is no longer threatened with extinction, the two phrases must be similar in form and structure. 

Furthermore, the phrase “on account of” means ‘as the result of’. So, the sentence would read - The North American bald eagle is no longer threatened with imminent extinction, primarily as the result of prohibiting hunting and the ban of a poisonous pesticide have led… The resulting sentence does not require the verb “have led” as the phrase conveys a modifier that provides a reason. The sentence should end at the noun ‘pesticide’. So, Options A and B can be eliminated.


Option D also lacks parallelism. So, Option D can also be eliminated.


Option E also lacks parallelism. Moreover, the pronoun ‘they’ has no appropriate antecedent. So, Option E can be eliminated.


In Option C, the noun ‘prohibitions’ is parallel to the noun ‘ban’. 

The construction of this option makes the noun phrase “prohibitions on hunting and the ban of a poisonous pesticide” the subject of the verb “have led”. Therefore, C is the most appropriate option.