Answer:
D
Step-by-step explanation:
 
        
             
        
        
        
I just checked and the right answer seems to be a) 5.5, I am truly sorry if it was incorrect but pls let me know if it was the right answer
        
                    
             
        
        
        
It's 4. The factors of 12 are: 1,2,3,4,6,12. The factors of 20 are: 1,2,4,5,10,20.