Which set of ordered pairs demonstrates a function? A (-2, -4), (-1, -2), (1, 2), (2, 4) B (-2, 4), (1, 2), (1, -2), (2, -4) C (-2, 4), (-1, 2), (-1, 2), (-2, -4) D (-2, 4), (-1, 2), (-1, -2), (-2, -4)