dialogue: W: Hello,this is Susan speaking. Is Mr. Brown in, please? M: Yes, speaking. W: Hi,Mr. Brown. Your son Ted missed the school trip this morning. Do you know why? M: Yes. He got up a bit late this morning. He missed the school bus. W: Why did he get up late? Didn't he have a clock? M: The clock didn't work this morning. I worked overtime till midnight at home last night, so I got up late,too. It was already nine o'clock when I woke him up. W: Well,why did he wake up at such a late hour? Did he go to bed late last night? M: Yes. He didn't go to bed until 11:00 pm. W: Why didn't you ask him to go to bed early? M: He's a "night owl". He can't fall asleep before 11:00 pm. W: You should really change his sleeping habits. Otherwise it will happen again. M: I will. Thank you for calling, Susan.
question: Why did Ted miss the bus this morning?
choice: He worked overtime. He didn't have a clock. He got up too late.
answer: He got up too late.