Simplify the Expression $4 \sqrt [ 3 ] { 64 x } + 4 \sqrt [ 3 ] { 8 x }$

Multiple Choice

Simplify the expression. Assume all variables represent positive real numbers.
- $4 \sqrt [ 3 ] { 64 x } + 4 \sqrt [ 3 ] { 8 x }$

A) $4 \sqrt [ 3 ] { 72 x }$
B) $24 x$
C) $6 \sqrt [ 3 ] { x }$
D) $24 \sqrt [ 3 ] { x }$