You are presented with the question "How does a fan cause air to move?" and the following answer choices: 
- direct energy
 - It cools down
 - Vanes stand still
 - electrically
 - It heats up
 - Vanes spin
 - kinetic energy
 - energy

Now knowing that the vanes rotating in an electric fan causes air to move and rotational motion occurs when an object spins, choose the best answer.


 

      Vanes spin   