Just need a brief explanation I already know the problem

GIVEN:
We are given the following expression;
[tex]\frac{\frac{x}{x-3}}{\frac{x^2}{x^2-9}}[/tex]Required;
Select an equivalent expression from the answer choices.
Step-by-step solution;
We begin by re-arranging the expression in a simple division format as follows;
[tex][/tex]