Which relation is a function?
A.
(5, –2), (4, 6), (–3, –2), (0, 4)
B.
(–1, –2), (3, –5), (–1, –5), (2, –2)
C.
(4, 3), (3, 2), (–1, 5), (4, 0)
D.
(–4, –4), (3, –3), (–4, 4), (–3, 3)