Sentence Correction

A huge flying reptile that died out with the dinosaurs some 65 million years ago, the Quetzalcoatlus had a wingspan of 36 feet, believed to be the largest flying creature the world has ever seen.
(A) believed to be
(B) and that is believed to be
(C) and it is believed to have been
(D) which was, it is believed,
(E) which is believed to be

IMO, answer should be C.

Solutions A and B use the verb "to be," which is incorrect because this is not parallel with the past tense verb "had." Eliminate.

D and E both use a non restrictive clause starting with the word "which." Whenever you see a non restrictive clause check the noun it refers to. Non restrictive clauses grammatically refer to the noun immediately preceding the clause - in this case it incorrectly refers to the word "feet." Eliminate.


C has to be the correct answer

GMATBootcamp wrote:IMO, answer should be C.

Solutions A and B use the verb "to be," which is incorrect because this is not parallel with the past tense verb "had." Eliminate.

Sentence reads that "the Quetzalcoatlus had a wingspan of 36 feet", and today also we believe that "it was the largest flying creature the world has ever seen. "

So i don't find any tense problem here, thus present tense seems ok. Plz clarify.