Question

A force can best be defined as:
a. a push or a pull
b. gravity or friction
c. something that is exerted
d. change in velocity over change in time

Answer 1

A force can best be defined as a push or a pull. 

Answer 2

Each of those choices causes me to recoil in discomfort
to a greater or lesser degree.

If forced to select one of them, I would choose (a).