2008版语法笔记上的一道题，求助啊~~

shkyxy

A discussion of our nation’sforeign policy must begin with the fact of there being an independent Western Europe which now thinks of itself intrans-nationalist terms.
(A) A discussion of our nation’s foreign policy mustbegin with the fact of there being
(B) Beginning any discussion of our nation’s foreignpolicy must be the fact of therebeing
(C) Any discussion of our nation’s foreign policymust begin with the fact that there is
(D) Any discussion of our nation’s foreign policymust begin by acknowledging the existence of
(E) To begin discussing our nation’s foreign policythee must be an acknowledgment of the fact that
正确答案为D，我选了C，为什么不对啊，我觉得用begin by 和with都解释得通啊？谢谢前辈解答