A、Boss and employee. B、Teacher and student. C、Customer and shop assistant. D、Tourist and travel agent. C推断题。女士的问话How can I help

W: Hi. How can I help you?
M: Yes, I’d like to return this sweater for a refund. I bought it a week ago.
W: Well, first of all, what seems to be the problem?
M: Well, the first time I washed and dried it, the thing shrank at least five sizes.
W: Uh, I see, but did you follow the washing instructions? I think it says here...yeah...on the label: to hand wash it and then to dry it on low heat.
M: How was I supposed to know that? The label is written in French!
W: Listen, sir! We take a lot of pride in our clothing. What I can do is allow you to exchange the sweater for another one.
M: I don’t want to exchange it for anything! I just want my money back!
W: Well, I can give you credit on your next purchase or a discount and[20]since the item you purchased was on clearance, we can’t give you a refund.
M: A clearance item! There wasn’t anything on the price tag or on the clothing rack that said anything about that.
W: I guess you didn’t read our ad. Look. Here’s the ad, and the information about the clearance sale is right here at the bottom.
M: Where? Where? What? That small print! You’d need an electronic microscope to see those words.
W: Anyway, you can only return items with a receipt within six days, and unfortunately, that was yesterday in your case.
M: OK. OK.[21]I give up. Take your sweater. You should open up a pet store and sell it as a dog sweater.
19. What is the probable relationship between the two speakers?
20. Why does the woman refuse to give the man a refund?
21. What’s the result of the conversation?