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