Decide What Values of the Variable Cannot Possibly Be Solutions $4 \sqrt { x } = \sqrt { 9 x + 9 }$

Multiple Choice

Decide what values of the variable cannot possibly be solutions for the equation.
- $4 \sqrt { x } = \sqrt { 9 x + 9 }$

A) $\left\{ \frac { 9 } { 7 } \right\}$
B) $\left\{ \frac { 9 } { 25 } \right\}$
C) $\left\{ - \frac { 9 } { 5 } \right\}$
D) $\left\{ - \frac { 9 } { 8 } \right\}$