Write in Radical Form $$( 9 m + n ) ^ { 8 / 9 }$$

Multiple Choice

Write in radical form. Assume all variables represent positive real numbers.
- $$( 9 m + n ) ^ { 8 / 9 }$$

A) $\sqrt [ 9 ] { 9 m + n ^ { 8 } }$

B) $\sqrt [ 8 ] { ( 9 m + n ) ^ { 9 } }$

C) $\sqrt [ 8 ] { 9 m + n ^ { 9 } }$

D) $\sqrt [ 9 ] { ( 9 m + n ) ^ { 8 } }$