【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 midafternoon.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.