Read the following conversation and answer the question.

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? 

- Pay the phone bill on time.

- Learn about the charges in advance.

- Ask permission to use the telephone.


Learn about the charges in advance.