The winner experienced less water resistance. There was more gravitational pull on the winner. Friction slowed down the second place swimmer. There was more force in the winner's kicks and strokes.
I gave my students this multiple choice question: Which sentence could not explain why the first place swimmer was faster than the second place swimmer?

Only one answer is correct among these 4 choices:
- The winner experienced less water resistance.
- There was more gravitational pull on the winner.
- Friction slowed down the second place swimmer.
- There was more force in the winner's kicks and strokes.

Could you tell me which one is correct?

There was more gravitational pull on the winner.