单项选择题

W: Look at this pink watch. It looks great, doesn't it And it's only $ 20.M:________

A.It's only twenty dollars. God knows it.
B.I don't want to look at it. After all, it's a watch.
C.The price is good.But I want to buy a more expensive watch.
D.How is it possible that a watch only cost us $ 20