You are presented with the question "what keeps food fresh?" and the following answer choices: 
- Enzymes
 - fur and fat
 - boiling water
 - refrigerators
 - microwaves
 - electricity
 - carrots
 - a hydraulic system

Now knowing that keeping food cold is used for keeping food fresh and refrigerators are suppose to add coldness to the food inside of it, choose the best answer.


 

    refrigerators     