You are presented with the question "What do most people need at least a little of every few days to survive?" and the following answer choices: 
- NACL
 - UV
 - mL
 - oxygen
 - corn
 - H20
 - rest
 - Hydrogen

Now knowing that most people can survive only a few days without water and water is everywhere H20, choose the best answer.


 

      H20   