A、Give his money back. B、Explain the washing instructions to him. C、Wash the shirt for him. D、Exchange for another shirt for him

W: Good afternoon, sir. Anything I can do for you?
M: Yes, I’d like to return this shirt I bought here about ten days ago for a refund.
W: Well, could you please tell me what seems to be the problem for returning?
M: I washed it only once and it shrank at least two sizes! And now I can’t wear it.
W: Oh, didn’t you follow the instructions? It’s on the label: to hand wash and dry it on low heat.
M: How could I possibly know it? The label is in French!
W: I’m sorry about that. But I can only help you to exchange for another one.
M: I don’t want to exchange. I want my money back!
W: Well, I can give you a ten percent discount on another purchase. But since the item you bought was on clearance, I’m afraid we can’t give you a refund.
M: What? It’s a clearance item! I didn’t know that.
W: I guess you didn’t read our advertisement. Here it is. And the information about the clearance sale is at the bottom.
M: Where? That small print! I have to use an electron microscope to read those words.
W: And anyway, you can only return items with the receipt within ten days, but unfortunately, that was yesterday in your case.
M: OK, OK, I give up. Take your shirt. You can take it to a pet store and sell it as a dog’s shirt.
19. Why does the man want to return the shirt?
20. What does the sales clerk offer to do for the man?
21. How does the man feel in the end?