Which of the following does NOT represent a function?
A. X y
0 7
1 7
2 7
3 7
B. X y
-5 11
-2 5
-1 2
1 -4
C. X y
-2 4
0 5
-2 6
1 7
D. X y
0 7
2 10
4 13
8 19
C. X y
-2 4
0 5
-2 6
1 7