如图所示，橡皮条OA和OA′之间的夹角为0°时，结点O吊着质

如图所示，橡皮条OA和OA′之间的夹角为0°时，结点O吊着质量为的砝码，O点恰好在圆心。现将A、A′分别移到同一竖直平面内的圆周上的B和B′点，且它们与竖直方向的夹角都为60°，要使O点仍在圆心上，则所挂砝码的质量只能是

A. B. C. D.

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