Rationalize the Denominator and Simplify $\frac { 7 } { \sqrt [ 3 ] { 9 x ^ { 2 } } }$

Multiple Choice

Rationalize the denominator and simplify. Assume that all variables represent positive real numbers.
- $\frac { 7 } { \sqrt [ 3 ] { 9 x ^ { 2 } } }$

A) $\frac { 7 \sqrt [ 3 ] { 9 x ^ { 2 } } } { 9 x ^ { 2 } }$
B) $\frac { 7 \sqrt { 3 x } } { 3 x }$
C) $\frac { 7 \sqrt [ 3 ] { x } } { x }$
D) $\frac { 7 \sqrt [ 3 ] { 3 x } } { 3 x }$