Simplify by Factoring $\sqrt{9 m^{15} n^{4}}$ A) $3 m^{7} n^{2}$ B) $3 m^{8} n^{3}$

Multiple Choice

Simplify by factoring.
- $\sqrt{9 m^{15} n^{4}}$

A) $3 m^{7} n^{2}$
B) $3 m^{8} n^{3}$
C) $3 m^{6} n^{2} \sqrt{m}$
D) $3 m^{7} n^{2} \sqrt{m}$