Write the Expression with Only Positive Exponents $8^{-7}$ A) $-8^{1 / 7}$

Multiple Choice

Write the expression with only positive exponents. Assume all variables represent nonzero numbers. Simplify if necessary.
- $8^{-7}$

A) $-8^{1 / 7}$

B) $-\frac{1}{8^{7}}$

C) $\frac{1}{8^{7}}$

D) $-8^{7}$