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

In order to determine whether or not white cabbage butterflies discriminate among flowers 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 - Among is used for more than 2 items , also whether or not is redundant
B.To determine whether white cabbage butterflies discriminate between - Correct
C.For determining
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