Fact 1: Killing microorganisms in food can be used to extend the shelf life of that food.

Fact 2: Irradiation kills microorganisms that spoil food.

Given the two facts above, answer the question "What can be used to extend the shelf life of food?" with the following options: 
- irradiation
 - farming
 - Dehydration
 - rays or beams
 - vegetables
 - Cooking
 - Enzymes
 - fruit


 

 irradiation        