Vertical.
the x value its the same for both, so you are going to the same point before moving up or down for the y value.
        
                    
             
        
        
        
I hope this helps you 
-3m-4m-8v+5v
-7m-3v
        
                    
             
        
        
        
I see 2 answers here. Company C and D at 8 months... (Companies A and B at 5 months) 
Explanation:
I took the Maximum and subtracted it by the Minimum. 
Ex. Company D: 27 (Max) - 19 (Min) = 8 months