Simplify the Radical $\sqrt { 44 x ^ { 7 } }$

Multiple Choice

Simplify the radical. Assume that all variables represent positive real numbers. $\sqrt { 44 x ^ { 7 } }$

A) $4 x ^ { 6 } \sqrt { 11 x }$
B) $2 \sqrt { 11 x ^ { 7 } }$
C) $2 x ^ { 3 } \sqrt { 11 x }$
D) $2 x \sqrt { 11 x ^ { 5 } }$