单选题 Woman: If the weather is this hot tomorrow, we may as well give up the idea of playing tennis in the afternoon.
Man: Oh, I don't think it'll last long. The weather forecast says it will cloud over by mid-afternoon.
Question: What does the man mean?
A. Weather forecasts are not reliable.
B. They'd better change their mind.
C. The tennis game won't last long.
D. They shouldn't change their plan.