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【单选题】
如图所示,一轻杆一端固定质量为m的小球,以另一端O为圆心,使小球在竖直平面内做半径为R的圆周运动,以下说法正确的是( )
A.
小球过最高点时,杆所受的弹力不能等于零
B.
小球过最高点时,速度至少为
C.
小球过最高点时,杆对球的作用力一定随速度增大而增大
D.
若把题中的轻杆换为轻绳,其他条件不变,小球过最高点时,速度至少为
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