The correct answer is 'bob and wheel'. Bob is a very short line, followed by a wheel, longer lines with internal rhymes. Bob and wheel is characteristic of Medieval literature, primarily The Pearl and Sir Gawain and the Green Knight.
        
             
        
        
        
teens drive to jobs and contribute to the national economy
 
        
                    
             
        
        
        
Buck and Spitz were chasing the same rabbit. 
 
        
             
        
        
        
Faustus snatches dishes as they are passed around the Pope's table.
Mephistophilis and Faustus beat the friars and throw fireworks.
 
        
                    
             
        
        
        
1. Easy to understand
2. %'s are too complex to figure out
3. Letter grades are funny to some kids