Determine which set of ordered pairs is a function.

A.

{ (-1, 3), (1, 4), (-1, 5) }

B.

{ (5, 3), (-6, 3), (-2, 4) }

C.

{ (0.5, 1.6), (1, 1.75), (1.5, 2.3), (0.5, 3.6) }

D.

{ (1, 2), (-5, 4), (3, 6), (-5, 2) }

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