Fact 1: Treating water is used to remove harmful substances before drinking.

Fact 2: For a scientist, water is H2O whether from the Ganga or a tap.

Given the two facts above, answer the question "Why do we generally treat H2O?" with the following options: 
- to add water to crops
 - hydration
 - vaporization
 - to water the garden
 - to drink it
 - looseness
 - to track it
 - evaporation


 

     to drink it    