Which of the following lists of ordered pairs is a function?

A.) (1, 2), (1, –2), (3, 2), (3, 4)
B.) (0, 2), (2, 3), (0, –2), (4, 1)
C.) (1, 6), (2, 7), (4, 9), (0, 5)
D.) (2, 4), (0, 2), (2, –4), (5, 3)