Which set of ordered pairs represents a function?

A) {(0, 1), (1,3), (1,5), (2, 3)}

B) {(0, 0), (1, 2), (2, 6), (2, 3)}

C) {(0, 0), (0, 2), (2.0), (2, 4)}

D) {(0.2), (1, 4), (2.6), (3, 6)}​