Simplify the Radical $\sqrt[8]{x^{20}}$ A) $x \sqrt{x}$ B) $x^{2} \sqrt[8]{x^{4}}$ C) $x^{2} \sqrt{x}$ D) $x^{2} \sqrt[4]{x^{2}}$

Multiple Choice

Simplify the radical. Assume that all variables represent positive real numbers.
- $\sqrt[8]{x^{20}}$

A) $x \sqrt{x}$
B) $x^{2} \sqrt[8]{x^{4}}$
C) $x^{2} \sqrt{x}$
D) $x^{2} \sqrt[4]{x^{2}}$