A body has its centre of mass at the origin. The x-coordinates of the particles

To be the avg sum of masses at the origin, all particles can’t be on one side, hence option (A) and (B) isn’t possible. In (C), all particles are non-negative, so they can be on zero. And in (D) situation wise it may differ, that some masses may be in positive and rest in negative, hence it is true also.