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【单选题】
图示三个均质圆盘A、B、C的重量均为P，半径均为R，它们的角速度w的大小、转向都相同。A盘绕其质心转动，B盘绕其边缘上O轴转动，C水平面上向右滚动而无滑动。在图示位置时，A、B、C三个圆盘的动量分别用KA、KB、KC表示，则下列说法正确的是【图片】A.
K A = K B= K C
B.
K A ¹ K B ¹ K C
C.
K A ¹ K B = K C
D.
K A = K B ¹ K C
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