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

A. (1, 1), (2, 3), (1, 5), (4, 7)

B. (0, 2), (4, 2), (0, –4), (4, –2)

C. (2, 4), (–2, 4), (3, 9), (–2, –4)

D. (2, 4), (3, 9), (4, 16), (5, 25)