Rationalize the Denominator $\frac{9 a}{\sqrt{5}}$ A) $\frac{81 \mathrm{a} \sqrt{5}}{5}$ B) $9 a \sqrt{5}$

Multiple Choice

Rationalize the denominator. Assume that all variables represent positive real numbers.
- $\frac{9 a}{\sqrt{5}}$

A) $\frac{81 \mathrm{a} \sqrt{5}}{5}$

B) $9 a \sqrt{5}$

C) $\frac{9 a \sqrt{5}}{5}$

D) 34