(单选题) Why can leaving school be a stressful time for teenagers?(本题3.0分)

A、 Because they will be leaving their favourite teachers.
B、 Because many people.s favourite memories are at school.
C、 Because they may worry about getting a place at university.
D、 Because they may worry about becoming an adult.
出自:佳木斯大学-大学英语Ⅱ(专升本)