Fact 1: Biofuel is used to produce electricity by burning.

Fact 2: Ethanol is the most widely used biofuel today.

Given the two facts above, answer the question "What is burning ethanol used to produce?" with the following options: 
- heat energy
 - rays or beams
 - adding heat
 - kinetic energy
 - energy
 - carbon dioxide
 - electricity
 - engines


 

       electricity  