Answer:
D
Explanation:
Hey There!
Remember in order for the relation to be a function none of the x values can repeat
For the first one the x value 0 repeats therefore it is not a function
for the second one the x value -7 repeats thus meaning that its not a function
for the third one the x value 6 repeats hence, it is not a function
for the last one each input has a different output therefore it is a function