Fact 1: Ethanol is produced by alcoholic fermentation of the glucose in corn or other plants.

Fact 2: Ethanol is a fuel made of corn.

Given the two facts above, answer the question "What can be used to make fuel?" with the following options: 
- heat energy
 - fermentation
 - burning coal
 - destruction
 - prayer
 - Wishful thinking
 - gasoline
 - Chemical energy


 

  fermentation       