graphite. the center of a pencil is generally graphite 
 
        
                    
             
        
        
        
The best answer I could find is that he thought inspiration came from hard work and discipline. A quote that supports this point would be when he said: "To know what you're going to draw, you have to begin drawing." So, inspirations doesn't just happen by chance. 
        
             
        
        
        
Answer: B) Diatonic
Explanation: The major scale is one of the most commonly used musical scales, especially in Western music. It is one of the diatonic scales.
Edit: Armor for Fish? Srsly?