You are presented with the question "What is used for generating heat by burning?" and the following answer choices: 
- carbon dioxide
 - sunlight
 - calcite
 - Calcium carbonate
 - water
 - ice
 - peachleaf willow
 - fossil fuels

Now knowing that coal is used for generating heat by burning and fossil fuels are coal, oil and natural gases, choose the best answer.


 

        fossil fuels 