Need help with this.

here the answer would be D

Explanation:

if the two substances together have a different weight then the substance split but added together then this suggest that a new substance with a whole new mass was formed.

d.) circle motion requires a force to give it a centripetal acceleration.

"hydrogen bonding is the attraction of h atoms in the water molecule (slight + charge) to o atoms in a neighboring water molecule (slight - charge); it is a weak interatomic force. but it is still strong enough to the water molecules "stick" together."