听力原文：M: Will you please show me that notebook？
W: Certainly.
M: How much is it？
W: Twenty-one yuan and fifty fen.
M: Hm. It's certainly nice, but it's a bit more than I was thinking of paying. I don't think I'll take it.
W: How about that size？ It's also very good and much cheaper.
M: Let me see one.
W: This size is ten yuan and ninety fen.
M: That's very reasonable. I'll take it then.
(12)

A. Ten yuan and ninety fen.
B. Twenty yuan and ninety fen.
C. Twenty-one yuan and fifty fen.
D. Ten yuan and fifty fen.