(A) genuine diamonds from imitation diamonds
(B) genuine diamonds apart from imitations
(C) between genuine diamonds and imitation diamonds
(D) among genuine diamonds and imitation diamonds
(E) whether diamonds are imitation or genuine
Solution:
Idiom*
Discriminate between or among is the correct usage. Since the discrimination is between two groups (and not more), between is the correct term.
Thus, C is the best choice.
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