Answer:
A
Step-by-step explanation:
L*W 
 
        
                    
             
        
        
        
I would think that it would be the 3:8 one because if you do the math, 8-3 is 5 and 12-5 is 7. The only reason Im doing it this way is because its the only way I can set it up. 
so you have more of a difference with the 12:5 one and less of a difference with the 3:8.
I hope I helped a bit
 
        
             
        
        
        
Answer:
9/34
Step-by-step explanation:
3/4 times 2 5/6
3/4 times 17/6
switch the denominator and numerator then, multiply.