Simplify Express Your Answer with Positive Exponents $2 ^ { - 4 }$

Multiple Choice

Simplify. Express your answer with positive exponents. Assume that all variables are nonzero.
- $2 ^ { - 4 }$

A) $\frac { 1 } { 8 }$
B) $\frac { 1 } { 16 }$
C) 16
D) $- 16$