Write the Expression with Only Positive Exponents and Evaluate If $5 x ^ { - 3 }$

Multiple Choice

Write the expression with only positive exponents and evaluate if possible. Assume all variables represent nonzero real
numbers.
- $5 x ^ { - 3 }$

A) $- \frac { 1 } { 15 x }$
B) $\frac { 5 } { x ^ { 3 } }$
C) $\frac { 1 } { 125 x ^ { 3 } }$
D) $- 15 x$