Add or Subtract $$4 \sqrt [ 3 ] { 125 x } + 4 \sqrt [ 3 ] { 8 x }$$

Multiple Choice

Add or subtract. Assume all variables represent nonnegative real numbers.
- $$4 \sqrt [ 3 ] { 125 x } + 4 \sqrt [ 3 ] { 8 x }$$

A) $28 \sqrt [ 3 ] { x }$
B) $4 \sqrt [ 3 ] { 133 x }$
C) $7 \sqrt [ 3 ] { x }$
D) $28 x$