Answer: First option.
Step-by-step explanation:
By definition, a relation is a function if each input value (value of "x") has only one output value (value of "y").
In the figure you can observe that each x-coordinate has more than one y-coordinate. Then, since each input value (value of "x") does not have only one output value (value of "y"), you can say that it is not a function, but a relation only.
Therefore, the conclusion is:
The set of ordered pairs represented by the graph, can be described as a relation only.