Simplify the Radical $\sqrt [ 3 ] { 648 }$ A)6
B)18
C)

Simplify the radical.
- $\sqrt [ 3 ] { 648 }$

A) 6
B) 18
C) $6 \sqrt [ 3 ] { 18 }$
D) $6 \sqrt [ 3 ] { 3 }$