(Please note that this question has at least two versions in GMATPrep. I got the version where option B was "devastation and enslavement in the name of progress by which native peoples of the Western Hemisphere have been decimated" and not "devastation and enslavement in the name of progress by which native peoples of the Western Hemisphere decimated")
I was wondering why is option B inferior to option E. Is it because option B uses passive voice whereas option E uses active voice?
[Also since I got this question in GMATPrep Exam 3, which has to be purchased, so as per the guideline https://www.manhattanprep.com/gmat/forums/read-before-you-post-gmatprep-verbal-guidelines-t2720.html, I did not post in GMATPrep folder. Let me know if I misunderstood the guidelines. ]