You are presented with the question "what heats food?" and the following answer choices: 
- water
 - electricity
 - ice
 - Enzymes
 - cooking oil
 - cells
 - Fuel cells
 - kinetic energy

Now knowing that apan is used for cooking food by heating food in it on a stove and heat pan, add cooking oil to pan, choose the best answer.


 

     cooking oil    