If eating unwashed strawberries can have a negative impact on humans, then what can have a negative effect on humans?

Answer choices:
- Proper exercise and nutrition.
 - Affirmation and praise.
 - influenza orthomyxoviruses
 - movement of tectonic plates
 - Eating unwashed strawberries.
 - Eating a healthy diet.
 - ozone depletion
 - scraping oneself on a contaminated object

 

     Eating unwashed strawberries.     