单选题:如图所示,点M沿螺线自内向外运动,它走过的弧长与时间的一次方成正比,则点的加速度越来越(  ),点M越跑越(  )。

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题目内容:
如图所示,点M沿螺线自内向外运动,它走过的弧长与时间的一次方成正比,则点的加速度越来越(  ),点M越跑越(  )。
A.大,快
B.小,慢
C.大,不变
D.小,不变
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