选择恰当的句子补全对话。
A：Can I help you?
B：Yes，please. This yellow dress is pretty.How much is it?
A：It's fortyyuan.
B：It's cheap.
A：Sure！Here you are.
B：
A：Do you like that red one?
B：
A：It's ninetyyuan.
B：
A．It's too big.
B．Can I try it on?
C．How much is it?
D．I want to buy a dress.
E．Oh，it's too expensive for me.