请教两道白勇语法题

DavidSimms

2. 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

答案是D，为何E不对？觉得D中as a group the rival of 结构不完整，怎么会正确呢？

17. Just as plant species native to regions with browsing mammals evolved many natural anti-browser defenses (such as sharp spines and toxic chemicals), so humans in malarial regions have evolved dozens of chemical defenses against malaria.
(A) so humans in malarial regions have evolved dozens of chemical defenses against malaria
(B) humans in malarial regions have been evolving dozens of chemical defenses against malaria
(C) there has been, in malarial regions, an evolution of dozens of human chemical defenses against malaria
(D) dozens of chemical defenses against malaria have been evolved by humans in malarial regions
(E) similarly, in malarial regions, humans have evolved dozens of chemical defenses against malaria

这个题的答案是A，为什么呢？

谢谢！

就醉一生

D:make his letters (as a group) the rival of

句意是 make his letters  the rival of

E:which 就近修饰group 错误，逻辑意思不符

just as ....so  和just as作用相同

just as .....so too主句倒装

DavidSimms

thanks a ton for ur quick reply! I'm clear now.