in the same direction in a vertical direction in a downward direction in the opposite direction
I gave my students this multiple choice question: During a collision, a seat belt slows the speed of a crash dummy. What is the direction of the net force exerted by the seat belt compared to the direction of the crash dummy's motion?

Only one answer is correct among these 4 choices:
- in the same direction
- in a vertical direction
- in a downward direction
- in the opposite direction

Could you tell me which one is correct?

in the opposite direction