单项选择题

Questions 7 to 10 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions.
Now, listen to the conversation.

Why does the man say he is the black sheep of the family

A.Because he is always in trouble at home.
B.Because he doesn’t live with his parents.
C.Because he often fights with other persons.
D.Because he wouldn’t study hard.