A.
Observe that point [tex](3,3)[/tex] can only be obtained via function A: [tex]\frac{1}{3}3^2=3[/tex].
In all other cases it fails,
[tex]\frac{1}{9}3^2\neq3[/tex]
[tex]3\cdot3^2\neq3[/tex]
[tex](\frac{1}{3}\cdot3)^2\neq3[/tex]
Hope this helps :)
