Use the Laws of Exponents to Simplify Each Expression Using $- 3 ^ { - 2 }$

Multiple Choice

Use the laws of exponents to simplify each expression using positive exponents only. Assume all variables represent nonzero real numbers.
- $- 3 ^ { - 2 }$

A) 9
B) $\frac { 1 } { 6 }$
C) $- \frac { 1 } { 9 }$
D) $- 9$