Simplify the Expression $( - 2 x ) ^ { 6 }$

Multiple Choice

Simplify the expression. Assume all variables represent nonzero real numbers.
- $( - 2 x ) ^ { 6 }$

A) $- 64 x ^ { 6 }$
B) $64 x ^ { 6 }$
C) $12 x$
D) $- 12 x$