Which set of ordered pairs (x, y) could represent a linear function?
A = {(-5,7), (−2,4), (1,1), (4, −3)}
B = {(−4, 2), (−2,4), (0,7), (2,9)}
C = {(0,9), (3, 3), (6,-3), (8, −9)}
D = {(-9,7), (-3,4), (3,1), (9,-2)}