Which statement best illustrates using the vertical line test to determine if the graph below is a function of x ?

a) the graph is not a function of x because the line x = 0 intersects the graph at two points.

b) the graph is a function of x because the line x = 5 does not intersect the graph

c) the graph is not a function of x because the line y = 0 intersects the graph at two points

d) the graph is a function of x because the line y = 5 does not intersect the graph