如图,点M是边长为4cm的正方形的边AB的中点,点P是正方形边上的动

如图,点M是边长为4cm的正方形的边AB的中点,点P是正方形边上的动点,从点M出发沿着逆时针方向在正方形的边上以每秒1cm的速度运动,则当点P逆时针旋转一周时,随着运动时间的增加,DMP面积达到5cm2的时刻的个数是(  

A. 5                   B. 4              

C. 3                   D. 2

答案

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