Which of the following relationships represents a function?
A.
(-4,4), (6,2), (-2,1), (9,2)
B.
(-4,4), (6,6), (-4,3), (9,2)
C.
(-4,4), (6,6), (6,3), (8,2)
D.
(-4,0), (6,3), (-2,1), (6,5)