The correct option is
B Not a function
Using Vertical line test
![](https://df0b18phdhzpx.cloudfront.net/ckeditor_assets/pictures/1111095/original_E1-03.PNG)
The vertical line cuts the graph at two points therefore the vertical line test fails.
∴ for one value of
x there are 2 values of
y.
Hence the given graph is a relation but not a function.