You are presented with the question "What would a turning blade cause?" and the following answer choices: 
- air to move
 - scattered light
 - contamination
 - killing insects
 - air to freeze
 - water to cool down
 - heat energy
 - air to stagnate

Now knowing that the vanes rotating in an electric fan causes air to move and electricity flows through an electric motor in a fan, causing the fan's blades to turn, choose the best answer.


 

 air to move        