A、At 9:00. B、At 9:30. C、At 7:30. D、At 8:00. C根据选项，推测对话的内容与时间相关。对话中出现了三个时间，一个是约会的时间，另外两个是两班飞机降落的时间，为了赶上约会的时间，只能在头一天7:30分到达，因此答案是C

W: It’s almost five o’clock and Mark’s not here yet.
M: If he doesn’t hurry, he’ll miss the train.
Q: What are they worried about?

M: I’d like a ticket to New York Tuesday morning. I have an appointment at 9: 00.
W: We only have a flight arriving there at 9: 30. I am afraid you’ll have to take a night flight arriving there at 7: 30.
Q: When can the man arrive in New York?