M: Hello. This is Mike. Who is it, please? W: Oh, Mike. This is Amy. My goodness! I've got hold of you, at last. M: Nice to hear from you again after all these years. What have you been doing? W: Well, I've tried many things since school. I'm now working for a food processing company in charge of sales. So I travel a lot. M: Oh, that's great. You must really enjoy it. W: Oh, I do. Yeah, it's interesting, but it's quite tiring. But, What about you, Mike? M: I work in a law firm, practicing in business law. W: Oh, that's challenging. M: Yeah, but I like my job., Question: What's the probable relationship between the two speakers? (A) Salesperson and customer. (B) Old school friends. (C) Fellow workers.
(B) Old school friends.