You are presented with the question "What are used to produce energy by burning?" and the following answer choices: 
- fossil fuels
 - cigarettes
 - organic molecules
 - Firecrackers
 - carbon dioxide
 - atoms
 - dust
 - batteries

Now knowing that coal is used to produce electricity by burning in coal-fire power stations and like coal, petroleum is a fossil fuel, choose the best answer.


 

 fossil fuels        