请问一道新东方的题

Byron possessed powers of observation that would have made him a great anthropologist and that makes his letters as a group the rival of the best novels of the time.

A.      makes his letters as a group the rival of

B.      makes his letters as a group one to rival

C.      makes his letters a group rivaling

D.     make his letters as a group the rival of

E.   make his letters a group which is the rival of