GMAT Sentence Correction (SC) | Re: There is no real conflict between nature and nurture; most biologists

There is no real conflict between nature and nurture; most biologists agree that the environmentnot only shapes the growth of an individual, but it also affects the expression of the individual’s genes.
A. not only shapes the growth of an individual, but it also affects
B. does shape the growth of an individual, but it also affects
C. is shaping the growth of an individual, it also affects
D. not only shapes the growth of an individual, but also affecting
E. is shaping the growth of an individual