13) A discussion of our nations foreign policy must begin with the fact of there being an independent Western Europe which now thinks of itself in trans-nationalist terms.
(A) A discussion of our nations foreign policy must begin with the fact of there being
(B) Beginning any discussion of our nations foreign policy must be the fact of there being
(C) Any discussion of our nations foreign policy must begin with the fact that there is
(D) Any discussion of our nations foreign policy must begin by acknowledging the existence of
(E) To begin discussing our nations foreign policy thee must be an acknowledgment of the fact that

My pick is C but the answer is D
Can somebody please explain...

Thanks