Answer:
C. (x, y) ⇒ (-x, -y)
Explanation:
Pick a point with different coordinates and compare those to the corresponding image point.
C = (-2, 3)
C' = (2, -3)
You will note that the signs of both coordinates changed, but the values stayed in the same place: (x, y) ⇒ (-x, -y), matching choice C.