Pentagon VWXYZ is shown on the coordinate grid. A student reflected pentagon VWXYZ across the x-axis to create pentagon V'W'X'Y'Z'. Which rule describes this transformation?
A. (x, y) ---> (x, -y)
B. (x, y) ---> (x, y + 8)
C. (x, y) ---> (-y, x)
D. (x, y) ---> (-x, y)