My sister didn’t leave the house key. As a result,...

Câu hỏi: My sister didn’t leave the house key. As a result, I can’t be cooking lunch now.

A. If my sister have left the house key, I could have been cooking lunch now.

B. If my sister had left the house key, I could have been cooking lunch now.

C. If my sister had left the house key, I could be cooking lunch now.

D. If my sister left the house key, I could be cooking lunch now.