Compare Β with the standard form of equation of a circle
Β (x - a)^2 + (y - b)^2 Β = r^2 Β where the center is at (a,b) and radius = r:-
Β (x - 9)^2 Β + (y + 8)^2 = 16
r^1 = 16 giving the Β radius = 4 Β That is a diameter of 8.
and center is at ( 9 , -8)
Correct choice is b.