Which statement(s) below serve(s) as a hypothesis explaining the behavior of two

Question

Which statement(s) below serve(s) as a hypothesis explaining the behavior of two objects as an isolated system moving with different initial velocities, then colliding with each other, then moving away from each other with different final velocities:

A) The velocity of one object before the collision becomes the velocity of the other object after the collision.
B) The change in the velocity of one object is equal to the change in velocity of the other object.
C) The vector change in the momentum of one object is equal and opposite to the vector change in momentum of the other object.
D) The vector total of the momenta of both objects before the collision is equal to the vector total of the momenta of both objects after the collision

I already did this, but I would like to make sure i'm right.

Explanation / Answer

D. A doesn't work unless they have the same mass. B doesn't work because they also have to have the same mass. C doesn't work because the vector changes may be equal in their scaling value, but NOT always the same. D is the only truly correct answer, because of conservation of momentum

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