To the chagrin of those who favor nurture over nature as the origin of human behavior, none of the studies on poverty explain why some of the people who grew up in poverty can escape it, while so many others who do cannot.
A. while so many others who do cannot
B. while so many other people who did so do not
C. while so many others who did cannot
D. although so many people who did were not able to
E. although a great many people were not able to

Source: McGraw Hill GMAT
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Parallelism:
Why some people who grew (did grow)____can___ , while so many others who did cannot..

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