Fact 1: Keeping food cold is used for keeping food fresh.

Fact 2: Refrigerators are suppose to add coldness to the food inside of it.

Given the two facts above, answer the question "what keeps food fresh?" with the following options: 
- Enzymes
 - fur and fat
 - boiling water
 - refrigerators
 - microwaves
 - electricity
 - carrots
 - a hydraulic system


 

    refrigerators     