A small car bumps into a large truck.
Compare the forces that the truck exerts on the car (F_truck on car) and the car exerts on the truck (F_car on truck) if before the collision the truck was stationary and the car was moving.

They are equal.

Explanation:

Newton's 3rd Law tells is that the forces of an action/reaction pair are equal and opposite. Since F_truck on car and F_car on truck are an action/reaction pair, they are equal no matter their state of movement before the collision.

e) none of the above answers are correct

i am pretty sure it is c because when people are closer together, they cannot move as freely. picture being in a mostly full elevator, for instance. the people are right next to you, and you can barely move.