Answer:
A and B are functions
Explanation:
To tell whether a graph is a function, you can use the vertical line test. If it is possible to draw a vertical line that crosses through two points on the graph, then the graph is not a function. On graphs A and B, no matter where you place the vertical line, it will only cross through one point in the graph. On graph C, you can tell that it does not pass the vertical line test because the vertical line f(x) passes through two points.