Speaker A: Good morning. This is John Parker speaking. Im just ringing to confirm my appoi

Speaker A: Good morning. This is John Parker speaking. Im just ringing to confirm my appointment with Mr. Smith for this afternoon. Speaker B: ______

A．How are you？ I"m sure Mr. Smith will be able to see you this afternoon

B．Yes. Mr. Smith is expecting you at 3 o"clock.

C．Hello, I"m Mr. Smith"s secretary. Do you mean you can come any time this afternoon？

D．Oh, John, when do you think you can come？

请帮忙给出正确答案和分析，谢谢！