C. The center of mass and center of gravity will coincide if the acceleration due to gravity is constant or uniform.
What is center of mass?
The center of mass of an object is the unique point where the weighted relative position of the distributed mass sums to zero.
What is center of gravity?
Center of gravity is the point from which the weight of a body or system may be considered to act.
Thus, the center of mass and center of gravity will coincide if the acceleration due to gravity is constant or uniform.
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