You are presented with the question "what does bottled water have none of?" and the following answer choices: 
- energy barrier
 - cloudy and rainy weather
 - harmful substances
 - layers of fat
 - energy usage
 - Brutal temperatures
 - Heat energy
 - hard outer covering

Now knowing that treating water is used to remove harmful substances before drinking and bottled water is often treated, choose the best answer.


 

   harmful substances      