[求助]请教TTGWD4-39这题的考点是什么，看不出来

想请教一下这题的考点是什么，还有A和B的区别是什么。答案是A，但是B除了没有用最高级，有語法错误吗？

Q27: TTGWD4-Q39.

Unearthed in China, fossils of feathered dinosaurs offer the most dramatic evidence yet discovered of the close evolutionary relationship between dinosaurs and birds.

A.    offer the most dramatic evidence yet discovered of the close evolutionary relationship between dinosaurs and birds

B.    offer evidence more dramatic than what has yet been discovered of the close evolutionary relationship between dinosaurs and birds

C.    offer more dramatic evidence of the close evolutionary relationship than any yet discovered between dinosaurs and birds

D.    have offered the most dramatic evidence of the close evolutionary relationship between dinosaurs and birds

E.     have offered more dramatic evidence than any that has yet been discovered of the close evolutionary relationship between dinosaurs and birds

追问d为啥不对