You are presented with the question "what part of an electric fan causes air to move?" and the following answer choices: 
- cover
 - mechanism
 - heat energy
 - electrically
 - turbines
 - cycles
 - fan base
 - heat

Now knowing that the vanes rotating in an electric fan causes air to move and turbines are usually made with a series of curved vanes on a central rotating spindle, choose the best answer.


 

     turbines    