You are presented with the question "What does burning coal in coal-fired power plants produce?" and the following answer choices: 
- Decibels
 - Fireplaces.
 - engines
 - organisms
 - Aloe plants.
 - Banana plants.
 - Energy.
 - warmth

Now knowing that coal is used to produce electricity by burning in coal-fire power stations and electricity is a form of energy, choose the best answer.


 

       Energy.  