Simplify Assume All Variables Represent Positive Real Numbers $\sqrt [ 3 ] { \frac { 7 } { 9 x ^ { 2 } } }$

Multiple Choice

Simplify. Assume all variables represent positive real numbers.
- $\sqrt [ 3 ] { \frac { 7 } { 9 x ^ { 2 } } }$

A) $\frac { \sqrt [ 3 ] { 567 x } } { 81 }$
B) $\frac { \sqrt [ 3 ] { 63 x } } { 9 x }$
C) $\frac { \sqrt [ 3 ] { 567 x ^ { 2 } } } { 9 x }$
D) $\frac { \sqrt [ 3 ] { 21 x } } { 3 x }$