Choose the Function That Is Equal To $f(x)=\frac{x+3}{x^{2}-9 x+18}$

Choose the function that is equal to $f(x) =\frac{x+3}{x^{2}-9 x+18}$

A) $g(x) =\frac{3+x}{(x+3) (x+6) }$
B) $g(x) =\frac{3}{(x-3) }+\frac{x}{(x-6) }$
C) $g(x) =\frac{3-x}{(x+3) (x+6) }$
D) $g(x) =\frac{3+x}{(x-3) (x-6) }$