Answer:
Its d
Step-by-step explanation:
I plugged the stuff into photo math and once solved d was equal to it
The answer is A because the x is on the other side of the equation
The distance formula is d=\sqrt{(x_{2}, x_{1})^{2} +(y_{2}, y_{1})^2
7=x1
4=y2
-8=x2
4=y2
Just plug in the missing values into the equation and solve the equation :)