Find the Indicated Root, or State That the Expression Is $- \sqrt [ 3 ] { 8 }$

Find the indicated root, or state that the expression is not a real number.
- $- \sqrt [ 3 ] { 8 }$

A) $- 2$
B) 2
C) $- \sqrt [ 3 ] { 2 }$
D) not a real number