Simplify the Expression $\left(\frac{\mathrm{r}^{-7 / 3}}{\mathrm{~s}^{-7 / 2}}\right)^{2}\left(\mathrm{r}^{-1 / 4} \mathrm{~s}^{-1 / 5}\right)^{-4}$

Multiple Choice

Simplify the expression. Write answer with positive exponents. Variables are positive real numbers.
- $\left(\frac{\mathrm{r}^{-7 / 3}}{\mathrm{~s}^{-7 / 2}}\right) ^{2}\left(\mathrm{r}^{-1 / 4} \mathrm{~s}^{-1 / 5}\right) ^{-4}$

A) $\frac{r^{11 / 3}}{s^{39 / 5}}$
B) $\frac{r^{17 / 3}}{s^{31 / 5}}$
C) $\frac{s^{31 / 5}}{r^{17 / 3}}$
D) $\frac{s^{39 / 5}}{r^{11 / 3}}$