单选题 Woman: It's awfully dark for four o'clock. Do you think it's going to rain?
Man: You'd better do something about that watch of yours. It must have stopped hours ago. Mine says seven.
Question: What conclusion can we draw from this conversation?
A. Neither of their watches keeps good time.
B. The woman's watch stopped 3 hours ago.
C. The man's watch goes too fast.
D. It's too dark for the woman to read her watch.