Which of the following set of ordered pairs when graphed does NOT represent a function?
A X (3, 2), (3, 4).(2,7), (8, 19) }
B {(-3, 17).(4.-6), (2,1),(0,4)}
C {(0.5, 0.25), (1,3), (9, 100),(14,52.5) }
D {(1,3), (2,6).(4.6), (6, 8))