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

Multiple Choice

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

A) $- 9$
B) $- \frac { 1 } { 27 }$
C) $\frac { 1 } { 27 }$
D) $- 27$