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【单选题】
质量为m，半径为R的均质圆盘，绕垂直于图面的水平轴O转动，其角速度为ω，在图4-78示瞬时，角加速度为零，C在其最低位置，此时将圆盘的惯性力系向O点简化，其惯性力主矢和惯性力主矩的大小分别为（ ）。
A.
mR/2ω2，0
B.
mRω2,0
C.
0，0
D.
0，1/2mR2ω2
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