Multiply and Then, If Possible, Simplify by Factoring $\sqrt{\mathrm{rs}} \sqrt{\mathrm{st}}$ A) $\sqrt{\mathrm{rst}}$

Multiple Choice

Multiply and then, if possible, simplify by factoring.
- $\sqrt{\mathrm{rs}} \sqrt{\mathrm{st}}$

A) $\sqrt{\mathrm{rst}}$
B) $\sqrt{\mathrm{rs}^{2} t}$
C) $\mathrm{s} \sqrt{\mathrm{rt}}$
D) $s^{2} \sqrt{\mathrm{rt}}$