Web Analytics

Which set of points represents a function?

A(0, 2), (1, 2), (2, 4), (3, 5), (4, 5)
B(1, 2), (2, 1), (2, 4), (3, 5), (4, 5)
C(3, 4), (2, 1), (4, 2), (3, 5), (4, 5)
D(5, 2), (3, 2), (4, 2), (5, 3), (4, 5)