I'm unable to see the image you referenced, but if you are trying to determine how long it takes for the ball to go down through the hoop, you would typically look for the point where the path of the ball (the solid parabola) intersects with the path of the hoop (the dotted line) on a graph.
If the options given are 17 seconds, 8 seconds, 17.9 seconds, and 18 seconds, you would select the answer that corresponds to the intersection point of the two lines on the graph.
Since I can't see the graph, I recommend checking where the two lines intersect and identifying the time at that point. If the intersection point is close to one of those options, that would be the answer to select.