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 do refrigerators do?" with the following options: 
- walk dogs
 - lowered energy cost
 - adding heat
 - hold gloves
 - Decrease bodily water
 - make air
 - keep food fresh
 - staying warm


 

       keep food fresh  