F: Good morning. Is there anything I can do for you? ,M: Good morning. I am looking for a pair of trousers for my son. Could I see that pair hanging in the window? ,F: Sure sir. Is this the pair you meant? ,M: Yes, that's it. What are these trousers made of? My son's skin is quite sensitive, so I have to be careful about the material of the clothes he wears. ,F: These are made of cotton, sir. These are made by a famous children's brand called Wonder World. It's a very popular brand because of the good quality material. ,M: Oh, that's good. What other colors do these trousers come in? If you have blue, that would be great. Blue is my son's favorite color. I'd rather not have black or gray. ,F: Uh, these come in blue as well. Here you are, a blue pair. ,M: Thank you. And one last thing, how much do the trousers cost? ,F: Well, they were originally 150 yuan each, but they are now on sale 20% off.
(A) M: Okay, so I'll pay you 120 yuan after discount. (B) M: Okay, so I'll pay you 120 yuan before discount. (C) M: Okay, so I'll pay you 130 yuan before discount. (D) M: Just a minute! I do not quite follow what you are saying, would you mind repeating that?
A