Let's put the chart into ordered pairs: (x, y) (2,1) (3,4) (3,3) (4,2) (5,5)
In bold, we see that there are two y-values at x=3. This means that this relation fails the vertical line test (two points on the same verticle line). This is not a function.
The answer options may be mis-written. The answer is no, because one x value corresponds to more than one y-value.
