Triangle FGH has vertices F(−3, 2), G(1, 3), and H(−1, −1). Triangle F′G′H′ has vertices F′(3, 2), G′(−1, 3), and H′(1, −1).
Which transformation of triangle FGH produced triangle F′G′H′?
A)a rotation of 90° counterclockwise around the origin
B)a rotation of 90° clockwise around the origin
C)a reflection across the y-axis
d)a reflection across the x-axis