F: Excuse me? I think you are in my seat. Look, it says 9B on my boarding card. ,M: Sorry, but could we exchange seats? This is my old friend. We haven't seen each other for a long time. I really want to sit next to him.
(A) F: Of course. Although 8B is my seat, you can sit here if you want to sit next a window. (B) F: No problem. You can exchange seat, if you would like to sit next to your new friend. (C) F: Okay. Let's exchange seat, so that you can sit next to your old friend. Have a good time. (D) F: I’m sorry, I didn’t understand. Could you repeat a little louder, please?
C