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V(CM) is velocity of C.M. of system and ...

`V_(CM)` is velocity of C.M. of system and M is the total mass of system. Pick up the wrong statement

(A) `M``V_(CM)` represent vector sum of the linear momenta of particles of the system.

(B) `M``V_(CM)` constant, if no external force act on the system.

(C) `M``V_(CM)` is constant even if external force is acting on the system.

(D) `M``V_(CM)` is not constant when only internal force act on the system.

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