Some people believe _______ has happened before or is happening now will repeat itself in the future.

A．whatever

B．whenever.

C．whereever

D．however

杆0A与均质圆轮的质心用光滑铰链A连接，如图所示，初始时它们静止于铅垂面内，现将其释放，则圆轮A所作的运动为（）。

A.平面运动

B.绕轴0的定轴转动

C.平行移动

D.无法判断