Three identical spheres of radius $r$ are placed on a horizontal surface such that they touch each other. These spheres are arranged such that their centers form an equilateral triangle. The center of mass of this system will be at ........

  • A
    The midpoint of the line connecting two spheres
  • B
    The center of any one sphere
  • C
    On the horizontal surface
  • D
    At the centroid of the triangle formed by their centers

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