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