题干
——Do you think students should be allowed to do their homework with music on?
—— . If so, they can't concentrate on the study.
A：I agree
B：I think so
C：I disagree
D：I have no idea.
答案(点此获取答案解析）
C
（千米）和行驶时间 
(小时)之间的函数关系的图象如图1所示. 根据题目和图象提供的信息，下列说法正确的是（ ）
