Fact 1: Acar engine usually converts gasoline into motion and heat through combustion.

Fact 2: Combustion is never complete in gasoline and diesel engines.

Given the two facts above, answer the question "What do cars use gas to produce?" with the following options: 
- Pollution
 - Energy.
 - thrust
 - energy
 - glycogen
 - deadly
 - motion
 - heat


 

       motion  