Simplify the Radical Expression $\sqrt [ 3 ] { x ^ { 15 } }$

Multiple Choice

Simplify the radical expression. Write the answer in radical form when appropriate.
- $\sqrt [ 3 ] { x ^ { 15 } }$

A) $x ^ { 3 }$
B) $x ^ { 12 }$
C) $x ^ { 5 }$
D) $x ^ { - 5 }$