M: Can I help you? W: Yes, well, I bought this tie last week for my husband's birthday, and er...well he doesn't like it. Could I change it for something else, such as a shirt or a hat? M: Certainly, madam, provided that it hasn't been worn, and if you have the receipt. W: Yes, here it is. M: OK, er... this tie looks as if it were worn. I'm afraid I can't put that back on the shelf. W: Oh, that's a pity., Question: Why did the assistant refuse to help the woman? (A) Because the woman didn't show him the receipt. (B) Because the thing she wanted to change had been worn. (C) Because the woman told a lie.
(B) Because the thing she wanted to change had been worn.