Simplify Remember That We Have Assumed That Radicands Do Not $\sqrt{25 x^{2}+30 x+9}$

Multiple Choice

Simplify. Remember that we have assumed that radicands do not represent the square of a negative number.
- $\sqrt{25 x^{2}+30 x+9}$

A) none of these
B) $(5 x+3) ^{2}$
C) $5 x+3$
D) $\sqrt{(5 x+3) ^{2}}$