听力原文：M: Hello.
W: Is this Mr. Green's office?
M: Yes, it is.
W: Is he there?
M: I'm sorry, he isn't. He's at a meeting this morning.
W: What time will he be back?
M: He'll be back after two o'clock but he'll only be in the office for an hour.
W: Can I reach him in the conference room?
M: I'm sorry, but they aren't taking any calls. Can I take message for you?
W: This is Anne Lucas in the accounts office. I would like a word with him, please.
M: I can ask him to call you after the meeting. Can I have your number?
W: Yes, it's 488—6361. He can reach me there until three o'clock.
What is Mr. Green doing?
A．Answering the phone.
B．Having a meeting.
C．Working in the office.