Write the Expression with Only Positive Exponents and Evaluate If $( - 3 ) ^ { - 1 }$

Multiple Choice

Write the expression with only positive exponents and evaluate if possible. Assume all variables represent nonzero real
numbers.
- $( - 3 ) ^ { - 1 }$

A) $- 3$
B) $\frac { 1 } { 3 }$
C) $- \frac { 1 } { 3 }$
D) 3