Lang has been playing clarinet for many years， but she still can’t play it smoothly and there’s some breaks in her playing.Why is that？

A.Because she is lack of confidence.

B.Because she doesn’t like playing clarinet but is forced to do so by her parents.

C.Because she is lack of practice.

D.Because that piece of music is too difficult for Lang.

正确答案：Because she is lack of confidence.