A graph of a quadratic function y = f(x) is shown below.

We are given a graph of a quadratic function y = f(x) .
We need to find the solution set of the given graph of a quadratic function .
Note: Solution of a function the values of x-coordinates, where graph cut the x-axis.
For the shown graph, we can see that parabola in the graph doesn't cut the x-axis at any point.
It cuts only y-axis.
Because solution of a graph is only the values of x-coordinates, where graph cut the x-axis. Therefore, there would not by any solution of the quadratic function y = f(x).
Answer:
Option B. ∅
Step-by-step explanation:
If a quadratic function f(x) is in the form of f(x) = ax²+bx+c then the solution of the function is the value of x.
If we analyze the graph for f(x) ≤ 0 solution of the function is null because parabola doesn't intercept at x axis.
Therefore there is no solution for the graphed function f(x).
Option B is the answer.