Q. A rigid body, under the action of external forces, can be replaced by two masses placed at a fixed distance apart. The two masses form an equivalent dynamical system, if

• (A) The sum of the two masses is equal to the total mass of body
• (B) The center of gravity of the two masses coincides with that of the body
• (C) The sum of mass moment of inertia of the masses about their center of gravity is equal to the mass moment of inertia of the body
• (D) All of the above