Which set of ordered pairs represents a function?

A { (2, 7), (2, 8), (3, 8) }

B { (3, 2), (3, 3), (3, 4) }

C { (4, 1), (5, 1), (4,4) }

D { (5, 6), (8, 6), (9, 6) }

does anyone know the answer

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