I'm pretty sure that it's C. I'm not quite sure though.
        
                    
             
        
        
        
I only know this so far-
4 elements 
Nitrogen (N)
Hydrogen (H)
Sulfur (S)
Oxygen (O)
        
                    
             
        
        
        
The more light absorbed, the quicker the photosynthesis rate.
        
             
        
        
        
You have to include the options given in order for people to answer it
        
                    
             
        
        
        
Answer:
No
Explanation:
Not all greenhouses have pest insects because there can be butterflies in a greenhouse to pollinate the plants and bees help pollinate too. There are some pest insects though such as the greenhouse white fly, Encarsia Formosa, and the mealybug