Use Radical Notation to Write the Expression $\left( - 8 x ^ { 9 } \right) ^ { 1 / 3 }$

Multiple Choice

Use radical notation to write the expression. Simplify if possible.
- $\left( - 8 x ^ { 9 } \right) ^ { 1 / 3 }$

A) $- 8 x ^ { 3 }$
B) $- 2 \sqrt [ 3 ] { x }$
C) $- 2 x ^ { 9 }$
D) $- 2 x ^ { 3 }$