The best answer is D because construction would be bad for the environment and take up space on the soil that is trying to be preserved. Also, for C, planting only one crop type in soil is not very beneficial to the soil at all. IT is best to plant multiple crops in the soil and move the crops to different parts of the soil each year when planting them. 
        
             
        
        
        
That way they can get the average result and they're usually more accurate.
        
             
        
        
        
Mitosis
because the cell split into two identical copies!
        
                    
             
        
        
        
The answer is C hope this helps
        
             
        
        
        
Do you have an answer choice? If so please put and I would love to help you.