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【单选题】
( cs02- 转动定律)半径为 R 具有光滑轴的定滑轮边缘绕一细绳,绳的下端挂一质量为 m 的物体.绳的质量可以忽略,绳与定滑轮之间无相对滑动.若物体下落的加速度为 a ,则定滑轮对轴的转动惯量为( )A.
（1）
B.
（2）
C.
（3）
D.
（4）
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