她不很爱说话，别人问了才回答，答的也不多。( )

A. She said little, only answering briefly when asked a question.
B. She doesn't like to talk. When others asked her, she would offer a brief answer.
C. She said little, and when others asked her, she would offer a brief answer.
D. She said little, and she answered only when others asked her, and her answer was brief.

为什么体育运动成为社会安全阀？