The correct answer is B. This is because A, C, and D all have flaws that great characters did not have. They basically just tried their hardest :)
        
                    
             
        
        
        
More information please :)
        
             
        
        
        
He plans to trap Claudius for the murder of his father
        
             
        
        
        
I really liked that one hufflepuff chick with the pink hair
        
             
        
        
        
D, as extrinsic means external stimulus. Andrew may not necessarily enjoy doing extra math problems, but there is an incentive, which is good grades. With the other 3 people, there is no incentive other than enjoyment.