Question 296033
Try some numbers
Let's take the extremes of x and y
x=4 y=6 x-y=-2
x=6 y=4 x-y=2
x=4 y=5 x-y=-1
x=6 y=6 x-y=0

So we see that x-y can  be less than  zero
so A) is the only one that matches