Triangle PQR has vertices P(-2,-1). Q(-1,4), and R(1,3). Triangle P'G'R' has vertices P' (-2,1).& (-1,-4), and R' (1, -3).
Which transformation maps APQR onto A P'O'R', preserving side lengths so that the triangles are congruent by SSS?
O A. reflection over the x-axis
B. reflection over the y-axis
C. reflection over the line y = x
O O
D. rotation 90° clockwise about the origin
E. rotation 180° clockwise about the origin