Answer:
D?
Step-by-step explanation:
Please do not quote me on it but it might be A. I would put A if I was doing that question. I might get it wrong so wait for other answers. If you need to make a problem for you age to years. It would not a relation and would be a function because each age would give an answer but not everyone doing that answer would be on their birthday. Sorry if I got it wrong ;-;. That is what makes sense in my head.