M: I can come to your house and pick you up in half an hour, is that alright? ,F: Sure, that means you will be here at 8:30.
(A) M: Okay. It's 8:00 now and I will come to your house and pick you up in half an hour. (B) M: OK, I see. I can come to your office and pick you up in half an hour. And now it's 8:30 now. (C) M: I am really sorry, I did not catch that. Would you slow down, please? (D) M: Yeah. I can come to your house and pick you up in two hours. And it's 8:00 now.
A