根据对话内容, 选择正确答案。
(Jack is on the phone.)
Alice: Hello!
Jack: Good morning, Mary!
Alice: I'm sorry. There is no Mary here.
Jack: Is it 472-8351?
Alice: No, it isn't. It's 472-8315.
Jack: I'm sorry. I called (拨打) the wrong number.
Alice: That's OK. Bye.
(Jack calls the right number.)
Jack: Hello! This is Jack.
Mary: Hi, Jack! This is Mary.
Jack: Mary, do you know (知道) Ms. Green's telephone number?
Mary: Ms. Green, our English teacher?
Jack: Yes. Do you know her phone number?
Mary: Yes. It's 693-5273.
Jack: Thanks, Mary.
Mary: You're welcome.