Which of the following relations is a function?

A. (0,4), (-1, 6), (0, 3), (-7, 2)

B. (6,1), (-1, 4), (0, 1), (6, 2)

C. (0,4), (-1, 2), (6, 1), (-7, 2)

D. (0,0), (-1, 3), (6, 1), (-1,5)

C.

Step-by-step explanation:

A. The input 0 = the outputs 4, 3

B. The input 6 = the outputs 1, 2

C. No inputs have more than one output

D. The input - 1 = the outputs 3, 5

Functions can only have one output for each input. So C is the only function.