The coordinates of the vertices of a triangle
 are P(2,3), R(4, 5), and S(6,3). The
 triangle PRS is reflected across the x-axis
 to create triangle P'R'S. Which rule
 describes this transformation?
 A. (x, y)--(-x, -y)
 B. (x, y)--(-x, y)
 C. (x, y) --(x, -y)
 D. (x,y) --(x,y)