46 Airline clerk: Good morning. May I help you? Customer: I’d like to reserve a ticket to San Francisco this Friday morning. Airline clerk: One way or round-trip? Customer: I am not sure. ______________________ (A) How long is the round-trip ticket good for? (B) How long will I stay in the West Coast? (C) Let me help you choose the right one. (D) It seems quite a long distance away.