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

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