Answer:
The correct answer choice is B
Explanation:
We use these brackets in the first place to show the main molecule interconnection with other appendage molecules. For example, Ca(OH)2. The main molecule of calcium is joined with other two molecules and  brackets are showing interconnection simply. However, these brackets can't tell us about the orientation and position of bond in 3D space. We have to utilize stereo-chemistry for that...
 
        
             
        
        
        
Answer:
  The answer is sunlight. 
Explanation:
         Sunlight is captured from the plants leaves and that energy is used to break down water into hydrogen and oxygen.
 
        
                    
             
        
        
        
A group of atoms bonded together