Which of the following sets of ordered pairs represents a function?
A
(–5 , 10), (0 , 15), (5 , 10)

B
(3 , 5), (3 , 9), (4 , 2)

C
(9 , 6), (6 , 3), (9 , 3)

D
(0 , 6), (12 , 10), (0 , –6)