It is certain that he didn’t finish his homework last night because he spent all night playing computer games.

A. He shouldn’t have finished his homework last night because he spent all night playing computer games.

B. He needn’t have finished his homework last night because he spent all night playing computer games.

C. He mustn’t have finished his homework last night because he spent all night playing computer games.

D. He can’t have finished his homework last night because he spent all night playing computer games.