Thread: flying creature

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

B?

Quetzalcoatlus is the subject in this sentence which had a wingspan of 36 feet, so I think C would be the correct answer