A、They got a wrong order number from the caller. B、They failed to deliver the computers on time. C、They couldn’t find the order

M: Hello, Mary. It’s John. I’ve got something to tell you about the delivery of computers.
W: Oh, yes. How is it coming along?
M: Well, we have problems with the ABC computer company.
W: Really? What kind of problem?
M: They haven’t delivered the order on time.
W: Oh, no. Why not?
M: I don’t know. Could you call them?
W: Yes, of course. What’s the order number?
M: It’s CPU3861. Mr. Peterson is the contact man.
W: All right. I’ll can you back later in the afternoon.