Multiply and Simplify, If Possible $9 \sqrt { m n ^ { 9 } } ( 6 \sqrt { m n } )$

Multiple Choice

Multiply and simplify, if possible. $9 \sqrt { m n ^ { 9 } } ( 6 \sqrt { m n } )$

A) $54 \mathrm { mn } { } ^ { 5 }$
B) $15 m \sqrt { n } 10$
C) $15 n ^ { 5 } \sqrt { m }$
D) $54 m ^ { 2 } n ^ { 5 }$
E) $54 m \sqrt { n ^ { 9 } }$