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Sentence Correction: Relative Clauses - Choosing the Correct Relative Pronoun

Whereas the nostrils of old world monkeys always turn downwards and their tails are never prehensile, in new world monkeys nostrils face sideways and most species have tails that can grasp objects.

Incorrect.

This answer choice is illogical. The opposition conjunction whereas compares two clauses, which should therefore be logically comparable and grammatically parallel. However, this answer choice compares the nostrils of old world monkey (a noun phrase) with in new world monkeys (a prepositional phrase).

In addition, the pronoun their is ambiguous as it can refer either to nostrils or to old world monkeys.

Incorrect.

While this answer choice corrects the original Pronoun ambiguity mistake, it introduces a new Comparison mistake.

The Comparative construction requires that the things compared be logically comparable. However, this answer choice illogically compares old world monkeys with the nostrils of new world monkeys.

[[snippet]]

In addition, the phrase having nostrils that always turn downwards and tails that are never prehensile is wordy and redundant.

Incorrect.

While this answer choice corrects the original Pronoun ambiguity and Comparison mistakes, it is grammatically incorrect. The relative pronoun whom should only be used to refer to humans but here it is used to refer to monkeys - a non-human noun, 

Incorrect.

While this answer choice corrects the original Pronoun ambiguity mistake, it introduces a new Comparison mistake.

The Comparative construction requires that the things compared be logically comparable. However, this answer choice compares the ... nostrils and ... tails of old world monkey (a noun phrase) with in new world monkeys (a prepositional phrase).

[[snippet]]

Excellent work!

This answer choice corrects the logical Comparison mistake by comparing two logically and grammatically comparable items: in old world monkeys ... VS. in new world monkeys... 

In addition, the original Pronoun ambiguity mistake is corrected by removing the ambiguous pronoun their.

Whereas the nostrils of old world monkeys always turn downwards and their tails are never prehensile, in new world monkeys nostrils face sideways
Unlike old world monkeys, having nostrils that always turn downwards and tails that are never prehensile, the nostrils of new world monkeys face sidewards
Unlike old world monkeys, in whom nostrils always turn downwards and tails are never prehensile, new world monkeys have nostrils that face sideways
Unlike the downward-facing nostrils and non-prehensile tails of old world monkeys, in new world monkeys nostrils are sideward-facing 
Whereas in old world monkeys nostrils always turn downwards and tails are never prehensile, in new world monkeys nostrils face sideways