You are presented with the question "What does a plant require to grow?" and the following answer choices: 
- Enzymes
 - sodium
 - Pesticides
 - Plantations
 - Farmers
 - sugar
 - H 2 O
 - photons

Now knowing that aplant requires water to grow and for example, For water, H 2 O is the molecular formula, choose the best answer.


 

       H 2 O  