dialogue: W: May I help you, sir? M: Yes. I'm looking for a nice gift for my mother. It's her birthday tomorrow. W: Do you have anything special in mind? M: No, not really. W: Perhaps she would like a necklace. We have many choices here. M: No, thanks. My mom doesn't like jewels. W: Well, then. Maybe a watch would be nice. M: Yes, that's it. She does need a new watch with big, clear numbers. She has complained a lot about the small numbers on her watch. W: This gold one is pretty, and I'm sure it will be easy for her to read the time. M: Don't you think it's a bit too fancy for old ladies? W: No, it actually sells very well and the old ladies like it very much. M: Maybe you are right. I'll take it. W: I'm sure your mother will love it. M: I hope so.
question: What was wrong with the watch of his mother's?
choice: It's broken. It's too small. Its numbers are too small for his mother.
answer: Its numbers are too small for his mother.