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1.        In ancient times, Nubia was the principal corridor where there were cultural influences transmitted between Black Africa and the Mediterranean basin.

(A) where there were cultural influences transmitted

(B) through which cultural influences were transmitted

(C) where there was a transmission of cultural influences

(D) for the transmitting of cultural influences（B）

(E) which was transmitting cultural influences

B is best, but I don't know the exact flaw in D. anyone can help me? tks!