Simplify the Radical Expression $\frac { \sqrt { 63 x ^ { 11 } } } { \sqrt { 7 x } }$

Multiple Choice

Simplify the radical expression. Assume that all variables represent positive real numbers.
- $\frac { \sqrt { 63 x ^ { 11 } } } { \sqrt { 7 x } }$

A) $3 x^{ 10}$
B) $3 x ^ { 5 } \sqrt { 7 }$
C) $3 \sqrt { \mathrm { x } ^ { 11 } }$
D) $3 x ^ { 5 }$