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Sentence Correction: Subject Verb Agreement - A Complex Subject/Long Distance between Subject and Verb

Noam Chomsky, who is not only an influential scholar in the fields of theoretical linguistics and cognitive science but also a political activist, an anarchist, and a libertarian socialist intellectual, has established himself as a prominent critic of US foreign and domestic policy.

This answer choice does not fit into the original sentence as a result of changing its end from as a prominent to prominently. There's no such thing as prominently critic.    

Incorrect.

This answer choice is grammatically incorrect. The singular subject Noam Chomsky does not agree with the plural verb have.

[[snippet]]

Incorrect.

While this answer choice is grammatically correct, it is stylistically flawed. Adding the word as before an anarchist and once again before a libertarian creates redundancy.

While it is true that stylistic mistakes are not always corrected, in this case there is an answer choice that is both grammatically correct and stylistically better than this one.

Incorrect.

This answer choice is grammatically incorrect. The singular subject Noam Chomsky does not agree with the plural verb have.

[[snippet]]

In addition, this answer choice changes the meaning of the original sentence by changing as a prominent critic to prominently established himself.

Excellent!

This answer choice correctly matches the singular verb has with the singular subject Noam Chomsky

an anarchist, and a libertarian socialist intellectual, has established himself as a prominent
an anarchist, and a libertarian socialist intellectual, have prominently established himself as a 
as an anarchist, and as a libertarian socialist intellectual, has established himself as a prominent
anarchist, and libertarian socialist intellectual, have established himself as a prominent
an anarchist, and a libertarian socialist intellectual, established himself prominently