Fact 1: Arefrigerator is used for keeping food fresh for a long period of time.

Fact 2: Air, heat and light cause dried food to spoil.

Given the two facts above, answer the question "A working refrigerator is good protection from what?" with the following options: 
- Electric devices
 - plastic
 - Abnormal cell growth
 - darkness
 - Temperature changing
 - a pathogens
 - air, light and heat
 - cold


 

       air, light and heat  