You are presented with the question "What does a combustion engine convert into motion?" and the following answer choices: 
- Gasoline
 - Grass clippings
 - energy
 - fossil fuels
 - Energy.
 - heat energy
 - A steam engine
 - An electric motor

Now knowing that agasoline lawn mower converts gasoline into motion and most mowers are powered by gasoline-driven combustion engines, choose the best answer.


 

 Gasoline        