Answer: A
Step-by-step explanation: if you want me to explain just comment
Answer:
The vertical line test can be used to determine whether a graph represents a function. If we can draw any vertical line that intersects a graph more than once, then the graph does not define a function because a function has only one output value for each input value.
.
.
Hope it help you
let's recall the vertical line test, if a vertical line hits the graph or points twice, then is NOT a function. Check the picture below.