W: Here's your bill, sir. M: Oh, thank you. Let's have a look at it now. Goodness, it's a lot more than I expected. W: Would you like me to explain anything, sir? M: Just a moment. Yes, what's this charge for $ 21.50 marked "J"? W: "J" is a charge for a long distance telephone call, sir. Did you make a telephone call that night? M: Yes. I remember now. Good heavens! We must have talked for a long time. And these ones, "L" for $ 32.40, and here's another, $ 9.50. What are they for?, Question: What lesson should the man learn? (A) Pay the phone bill on time. (B) Learn about the charges in advance. (C) Ask permission to use the telephone.
(B) Learn about the charges in advance.