HELP!!! Now
Which of the following tables represents a relation that is a function?

A-
x y
3 −2
3 −1
3 0
3 2
3 2

B-
x y
−3 3
−1 3
0 3
0 −3
2 3

C-
x y
−4 −3
−3 1
−2 −4
1 1
1 −2

D-
x y
−2 0
−1 2
0 1
2 0
5 2