(C)

从A、B、C、D四个选项中选出适当的句子填入下面的横线上
Dear Annie,
I’ve never written a letter to a newspaper before, I have just never felt the need to do such a thing. I have always felt I was quite able to do everything by myself,     .
Sometimes you really need help in life, I guess. And that’s why I’m writing this letter to you.
I have a happy family. I love my children and they love me. I’m a mother of three children. I know well how to bring up(养大) children, and two of them are already over twenty, so it is nothing new for me.
But now I have a serious problem: the Internet problem. My little son is just sixteen, and I feel he should do a lot of homework now,      . He can happily spend six or eight hours at a time on the Internet every day. He chats with people that he has never met before,      . He does lots of meaningless things on the Internet. And he sees red(大怒) if you ask him to do his homework.
I just want him to be a good student. Now he seldom does his lessons at home. I’m afraid he will drop behind in his class soon. His father is a doctor, a very kind man. He never seems to be afraid of his father.
What can I do? And don’t tell to talk to him. We’ve tried that and it didn’t work. But this is really a big problem in our family. I have tried everything I can think of.        . You are my last hope. Please tell me what I can do!
Yours,
Ellen Smith
According to the passage, what is the serious problem that Ellen Smith has?

A．She is a mother of three children and she didn't know well how to bring up(养大) children.

B．Her little son spent too much time on the Internet doing lots of meaningless things and he has little time to do his lessons.

C．Her little son has dropped behind in his class.

D．Her husband is a doctor and very kind.