请大家帮忙看看这一题。为什么答案会是C？是何逻辑？我是菜鸟一只；尚未上过任何GMAT课程。准备考GMAT。看了此题，很是茫然。请大家赐教！谢谢！
If A, then B.
If B, then C.
If C, then D.
If all of the statements above are true,
which of the following must also be true?
(A) If D, then
A.
(B) If not B,
then not C.
(C) If not D,
then not A.
(D) If D, then E.
(E) If not A, then not D.
充分必要条件的关系，把FF讲义去搜出来看一遍就懂了。
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