Sentence Correction

For some people, eating fatty foods may not actually result in drastic weight gain, but it is unhealthy to such a large degree that damage can be caused to the heart.

A. it is unhealthy to such a large degree that
B. it is so unhealthy that
C. doing so unhealthy to such a large degree that
D. doing so is so unhealthy that large degrees of
E. doing so is so unhealthy that

OA E

Source: Economist Gmat