You are presented with the question "Doing what to food can extend shelf life by removing microorganisms?" and the following answer choices: 
- warming
 - Dehydration
 - cooling
 - Cooking
 - bacteria
 - burning
 - irradiating
 - hydration

Now knowing that killing microorganisms in food can be used to extend the shelf life of that food and irradiation kills microorganisms that spoil food, choose the best answer.


 

       irradiating  