A、He is suffering from the difference of time zones. B、He has been studying hard at night. C、He finds biology difficult to learn

W: Are you going to be able to come with us to a football match this evening?
M: I’d love to. But my history assignment is due tomorrow, and I still have two chapters unfinished.
Q: What will the man probably do this evening?

M: Since I came here, I’ve had to stay up most of the night for the last few days. No matter what time I go to bed, I always wake up in the middle of the night.
W: Your biological rhythms probably haven’t adjusted to the time schedule here.
Q: What is the man’s trouble?