I inserted a picture of a question please state whether the answer is a b c or d

Given:
[tex]\begin{gathered} y=x^2 \\ y=\mleft(\frac{1}{3}x\mright)^2 \end{gathered}[/tex]The graph of g(x) is the graph of f(x) horizontally stretched by a factor of 3.
ption D is the final answer.