A、Because she may lose her belongings. B、Because she may miss the stop. C、Because it’s harmful to her health. D、Because there is

W: Sorry, I’m late. The train was delayed. I got stuck on the platform for about 20 minutes.
M: Yeah, it happens from time to time. How are you finding the commuting anyway?
W: Well, it’s a shock to the system to be honest. Last night I was coming home from the office, and I got caught in the mad rash in Shibuya. It was unbelievable, everyone jammed in like sardines.
M: Yeah, and then just when you think there’s no way anyone else could fit on, five more people barge through!
W: I’ve got a hand IT to the train companies though. Whoever devised the schedules is a genius. It’s amazing how different trains arrive at the same time for people to change.
M: I know. Back home, 20 minutes late for a train is pretty standard!
W: So what do you do to take your mind off things on the train? I tried to read a book, but I couldn’t turn the page—not enough space!
M: I usually listen to music, it helps block out everything. But if I’m really tired, I tend to just nod off for a few minutes.
W: Isn’t that a bit risky? You don’t wanna miss your stop.
M: You watch the businessmen do it. They have it done to an art form. They’ll wake up just before their stop.
W: I’m afraid if I close my eyes, I won’t be waking up so quickly!
Questions 12 to 15 are based on the conversation you have just heard.
12. How long did the man get stuck on the platform?
13. Why does the woman think that the person who designed the schedules is a genius?
14. What does the man do on the train?
15. Why does the woman think it’s risky to sleep on the train?