Multiple Response: Newton's second law (select 3)

AOne object exerts a force on another object.
BChanges the motion of an object
CActing on a single object.
DObject exerts a force that is equal in size and opposite in direction back.
EActing on two different objects

I know A is one of the answers..but i'm confused on what the other 2 are.

Verified Answer :

The BIG Equation. Newton's second law of motion can be formally stated as follows: The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

D i believe is one and c maybe