GMAT Sentence Correction (SC) | Re: In order to determine whether or not white cabbage butterflies discrim

In order to determine whether or not white cabbage butterflies discriminate among flower that contain nectar and those that do not, entomologists have designed experiment that they hope will reveal the flower - visiting pattern of these butterflies.

A.In order to determine whether or not white cabbage butterflies discriminate among
B.To determine whether white cabbage butterflies discriminate between
C.For determining if white cabbage butterflies discriminate or not between
D.Because