Rationalize the Denominator $\frac{9}{\sqrt{7}}$ A) 58
B) $\frac{81 \sqrt{7}}{7}$ C) $9 \sqrt{7}$ D) $\frac{9 \sqrt{7}}{7}$

Multiple Choice

Rationalize the denominator. Assume that all variables represent positive real numbers.
- $\frac{9}{\sqrt{7}}$

A) 58
B) $\frac{81 \sqrt{7}}{7}$
C) $9 \sqrt{7}$
D) $\frac{9 \sqrt{7}}{7}$