Simplify Remember That We Have Assumed That Radicands Do Not $\sqrt{\left(9 x^{2}\right)^{2}}$

Multiple Choice

Simplify. Remember that we have assumed that radicands do not represent the square of a negative number.
- $\sqrt{\left(9 x^{2}\right) ^{2}}$

A) $3 x^{2}$
B) $9 \mathrm{x}$
C) $3 \mathrm{x}$
D) $9 x^{2}$