Simplify the Radical Expression $\sqrt [ 3 ] { 54 }$

Multiple Choice

Simplify the radical expression. Assume that all variables represent positive real numbers.
- $\sqrt [ 3 ] { 54 }$

A) $3 \sqrt [ 3 ] { 2 }$
B) 3
C) 6
D) $3 \sqrt [ 3 ] { 6 }$