increasing the size of the two magnets increasing the distance between the two magnets changing the color of the two magnets changing the texture of the two magnets
I gave my students this multiple choice question: Which factor will cause a decrease in the force of attraction between two magnets?

Only one answer is correct among these 4 choices:
- increasing the size of the two magnets
- increasing the distance between the two magnets
- changing the color of the two magnets
- changing the texture of the two magnets

Could you tell me which one is correct?

increasing the distance between the two magnets