有一道题纠结很久了，求大神解答

我是一颗糖UID: 3518464

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
答案选D
我知道主语是复数所以排除ABC
E有which所以不选

可是我的疑问是，and 前后应该时态一致啊，所以正确答案为什么不是would have made his letters as a group the rival of就算D助动词省略了，那也made his letters as a group the rival of而不是make

我是一颗糖UID: 3518464

求解答

我是一颗糖UID: 3518464

求解答啊

恒UID: 2193975

Would have done是要做但是没有的事情,would do就是我们平常意义上的让成为。。。
这题用make是跟前面的would平行的。
有人物背景，说的是拜伦。前半句说成为人类学家，他其实木有成为，后半句说是他的信件，后半句本身作为事实是成立的，是would加原形。
但是因为GMAT是选最佳答案，一般不就结这些，直接排除法。。。