GWD 25-5

For many revisionist historians, Christopher Columbus has come to personify devastation and enslavement in the name of progress that has decimated native peoples of the Western Hemisphere.

A.     devastation and enslavement in the name of progress that has decimated native peoples of the Western Hemisphere

B.     devastation and enslavement in the name of progress by which native peoples of the Western Hemisphere decimated

C.    devastating and enslaving in the name of progress those native peoples of the Western Hemisphere which in the name of progress are decimated.

D.    devastating and enslaving those native peoples of the western Hemisphere which in the name of progress are decimated.

E.     the devastation and enslavement in the name of progress that have decimated the native peoples of the Western Hemisphere.

一直在a、b间摇摆，答案选a，但不明白b为什么错了？

B.     devastation and enslavement in the name of progress by which native peoples of the Western Hemisphere decimated

B is wrong for several reasons:

1) "decimated" should be "have been decimated"

2) "by which" is awkward when it means something initiated by progress, although grammartically it is not wrong.

3) 能用主动时，尽量不要用被动