Final answer:
The total momentum of a system with no external forces remains constant due to the conservation of momentum.
Explanation:
The total momentum of a system of many bodies that interact with no external forces remains constant. This is explained by the principle of conservation of momentum, where the initial momentum of the system equals the final momentum.
For example, in a collision between two objects in an isolated system, the total momentum before the collision is equal to the total momentum after the collision, even if individual momenta change.
Therefore, the correct answer is C) remains constant.
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