Which of the following tables represents a function?

A) x 2 2 3 3
y 5 -5 6 -6

B) x 4 -4 4 -4
y 1 2 3 4

C) x 6 6 7 7
y 2 3 4 5

D) x 2 -2 4 -4
y 8 8 12 12​