please help, will mark brainliest if you get it right :).

Answer:
Step-by-step explanation:
It is not a function because it does not pass the vertical line test. You can not have the same x in a function.
Answer:
C
Step-by-step explanation:
If you properly perform the vertical line test, you can see that the points are on the same x, which means the graph is undefined and not a function.
Hope this helps!