You are presented with the question "what does hydropower require doing to a river?" and the following answer choices: 
- power stations
 - water conservation
 - storing water
 - to move people
 - devastating it
 - a hydraulic system
 - dangerous
 - heating liquids

Now knowing that hydropower requires damming a river and scientists agree that dams devastate rivers, choose the best answer.


 

     devastating it    