If you add more gray to a color, it make the color a darker shade of whatever the color is, if you were to add white it'd be a lighter shade of color
        
             
        
        
        
Lightly so if you make a mistake you can erase it easily
        
                    
             
        
        
        
Answer:
B
Explanation:
More or less, the other choices have a strict role they have to perform, the assistant director has a less grounded role on his end, making it the most solid option