You are presented with the question "How does a car engine create movement?" and the following answer choices: 
- Oil
 - Added pressure
 - electricity
 - activation energy
 - contracting
 - a hydraulic system
 - Burning water and salt
 - Burning fuel and air

Now knowing that acar engine usually converts gasoline into motion and heat through combustion and an internal combustion engine burns a mixture of fuel and air, choose the best answer.


 

        Burning fuel and air 