Use Properties of Rational Exponents to Simplify the Expression $\frac { \left( 3 x ^ { 5 / 7 } \right) ^ { 4 } } { x ^ { 1 / 7 } }$

Multiple Choice

Use properties of rational exponents to simplify the expression. Assume that any variables represent positive numbers.
- $\frac { \left( 3 x ^ { 5 / 7 } \right) ^ { 4 } } { x ^ { 1 / 7 } }$

A) $81 x ^ { 19 / 7 }$
B) $27 x ^ { 8 / 7 }$
C) $3 x ^ { 19 / 7 }$
D) $81 x ^ { 5 }$