Simplify by Rationalizing the Denominator $\frac { \sqrt { x } - 3 } { \sqrt { x } + 3 }$

Multiple Choice

Simplify by rationalizing the denominator.
- $\frac { \sqrt { x } - 3 } { \sqrt { x } + 3 }$

A) $- 6 \sqrt { x }$
B) $\frac { x - 6 \sqrt { x } + 9 } { x - 9 }$
C) $- 1$
D) $\frac { x + 9 } { x - 9 }$