What is the conclusion of the following argument?

Given that he didn't say he did it, he didn't do it. For if he had done it, he would have felt too guilty not to say that he did it.

A. He didn't say he did it.
B. He didn't do it.
C. He did it.
D. He would have felt too guilty not to say that he did it.
E. If he had done it, he would have felt too guilty not to say that he did it.