听力原文：W: You have a telephone call, Mr. Smith.M: Who is it？W: He didn't say.M: Tell him

听力原文：W: You have a telephone call, Mr. Smith.

M: Who is it？

W: He didn't say.

M: Tell him I'm not in the office. Say I'll be back by four o'clock.

W: All right. Hello, sir... ？

M: Yes？

W: I'm afraid he's just stepped out of the office. May I ask who's calling？

M: Yes, this is Edgar Davis from Boston.

W: Oh, yes, Mr. Davis. I am afraid he won't be back until four o'clock. Could you give me your number, please.

M: Yes.

What does Mr. Smith tell his secretary to say？

A．He'll phone the caller at four o'clock.

B．He's out of his office.

C．he'll be on the phone at once.