Fact 1: Agasoline lawn mower converts gasoline into motion.

Fact 2: Most mowers are powered by gasoline-driven combustion engines.

Given the two facts above, answer the question "What does a combustion engine convert into motion?" with the following options: 
- Gasoline
 - Grass clippings
 - energy
 - fossil fuels
 - Energy.
 - heat energy
 - A steam engine
 - An electric motor


 

 Gasoline        