You are presented with the question "What can be used to make fuel?" and the following answer choices: 
- heat energy
 - fermentation
 - burning coal
 - destruction
 - prayer
 - Wishful thinking
 - gasoline
 - Chemical energy

Now knowing that ethanol is produced by alcoholic fermentation of the glucose in corn or other plants and ethanol is a fuel made of corn, choose the best answer.


 

  fermentation       