Answer:
D
Step-by-step explanation:
Hello There!
In order for a relation to be a function the x value cannot repeat
In answer choice A the x value 3 repeats therefore a cannot be the answer
In answer choice B the x value -1 repeats therefore B cannot be the answer
In answer choice C the x value -1 repeats therefore C cannot be the answer
In answer choice D none of the x values repeat so d is your answer
