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

Fact 2: Ethanol, a form of alcohol, is already the most common biofuel.

Given the two facts above, answer the question "a form of alcohol is used to produce electricity by what?" with the following options: 
- reducing heat
 - burning
 - spreading seeds
 - sharing pressure
 - deadly
 - drinking
 - consumers
 - Decibels


 

  burning       