听力原文：W: You look exhausted this morning, Peter.M: I am pretty tired. I stayed up almos

听力原文：W: You look exhausted this morning, Peter.

M: I am pretty tired. I stayed up almost all night getting ready for the final exam this morning.

W: Have you gotten the results of the test yet？

M: Yes, but unfortunately, my grade could have been much better.

How does the man feel about his grade？

A．It was an improvement.

B．It was disappointing.

C．It was unfair.

D．It was satisfying.

请帮忙给出正确答案和分析，谢谢！