You are presented with the question "What is controlled by pushing on bike pedals?" and the following answer choices: 
- motion
 - weight
 - pressure
 - health
 - cycles
 - driving
 - Energy.
 - speed

Now knowing that pushing on the pedals of a bike cause that bike to move and speed is controlled by pedalling and by pushing back on the moving pedals, choose the best answer.


 

        speed 