Write the Rational Exponent Expression as an Equivalent Radical Expression $(7 \mathrm{x})^{-1 / 7}$

Multiple Choice

Write the rational exponent expression as an equivalent radical expression.
- $(7 \mathrm{x}) ^{-1 / 7}$

A) $\frac{-7}{\sqrt[7]{x}}$
B) $\frac{1}{\sqrt[7]{-7 x}}$
C) $\frac{1}{\sqrt[7]{7 x}}$
D) $7 \sqrt[7]{x}$