Answer: D x² + y² = 9
Explanation:
Standard form of a circle formula:
(x-h)² + (y-k)² = r²
where (h,k) is the center and r is the radius
(0,0) = (h, k)
r= 3
substitute:
(x-0)² + (y-0)² = 3² >square the 3 and x-0 = x
x² + y² = 9 >A could be answer substituted but not simplified
D is your answer