I didn’t know that Lam had to get up early, so...

Câu hỏi: I didn’t know that Lam had to get up early, so I didn’t wake him up.

A If I had known that Lam had to get up early, I would have woken him up.

B If I know that Lam have to get up early, I will wake him up.

C If I knew that Lam had to get up early, I would wake him up.

D If I knew that Lam had to get up early, I would have woken him up.