请问大全中一句话的翻译

20.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，

这题选D，我想问一下D中这句话翻译成中文是什么样的呀？看了好久就是不明白，什么his letters as a group, 谢谢

是“make + 名词 + 名词”的结构

make + his letter as a group + the rival of the best novels of the time

主干就是：使他的信成为当代最好的小说的有力竞争对手，as a group 修饰his letter，要翻译就译成“编辑在一起”吧