請問一題

Byron possesed 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

答案: D
我的疑問為: 過去我的認知裡是 make + O( 受詞) + OC ( 受詞補語)
1) 而此題選項(D) 裡, make.....as .......有出現prep " as ", 請問解釋上的意思為何?
2) 請問選項(E) 裡哪裡出現錯誤

請各位高手幫忙解惑~