You are presented with the question "A cactus stem is used for storing what?" and the following answer choices: 
- roots
 - rain
 - cactus seeds
 - CO2
 - RNA
 - calories
 - H20
 - h2o

Now knowing that acactus stem is used for storing water and h20 Bottled water was generally consumed last year, choose the best answer.


 

       H20  