Independence
When pursuing higher education after high-school you now have the opportunity to decide where and what you want to do.
 
        
             
        
        
        
The answer is: When Kirsten turns over paper.
Recycling is the process of converting waste into material or products of potential utility bringing the reducing of the consumption as a consequence. In this scenario, Kirsten turns the paper to take advantage of the blank space. When she gets tired of one side of the painting, she can use the other painting. Kirsten then saved up  the use of another paper, using the blank side of the same paper she had used before.
 
        
                    
             
        
        
        
D. It did not allow for a centralized government
 
        
                    
             
        
        
        
Basically economic problem