Helppppp
Which set of ordered pairs represents y as a function of x?

A.O {(0, 0), (-1, 2), (-1, -2), (-2, 4). (-2, -4)}
B.O {(0, 0), (1, 1), (2, 4), (3, 9), (3, 16)}
C. {(0, 0), (0, 1), (0, 2), (0, -1), (0, -2)}
D.O {(0, 0), (-1, -0.5), (-2, -1), (-3, –1.5), (-4, -2)}