Determine which relation is a function.


A.

{(–3, 3), (–2, 3), (–1, 1), (0, 4), (0, 1)}


B.

{(–3, 2), (–1, 3), (–1, 2), (0, 4), (1, 1)}


C.

{(–3, 2), (–2, 3), (–1, 1), (0, 4), (0, 1)}


D.

{(–3, 2), (–2, 3), (–1, 2), (0, 4), (1, 1)}