I need help with this question and explaining the answer

Answer:
A function
Explanation:
To determine if a graph is a function or not, we need to use the vertical line test.
To conduct the vertical line test, we draw vertical lines that cut through the graph.
If a vertical line intersects the graph at exactly one point, it means that the relation is a function since a single value of x is only associated with a single value of y which is the definition of a function.
If the vertical line intersects the graph more than once, it implies that the relation is not a function since a single of x will be associated with more than one value of y.
Considering the given graph, drawing vertical lines across the graph(we can consider the vertical grid lines as the vertical lines), we see that each vertical line only intersects the graph at only one point, therefore the graph represents a function.