He didn't take his father's advice; that's why...

Câu hỏi: He didn't take his father's advice; that's why he was out of work. 

A. A. If he had taken his father's advice, he would not have been out of work.

B.  If he took his father's advice, he would not be out of work.

C.  If he had taken his father's advice, he would not be out of work.

D.  If he had taken his father's advice, he would not have been out of work.