Use Radical Notation to Write the Expression $9 x ^ { 1 / 5 }$

Multiple Choice

Use radical notation to write the expression. Simplify if possible.
- $9 x ^ { 1 / 5 }$

A) $\frac { 9 } { 5 } x$
B) $\sqrt [ 5 ] { 9 \mathrm { x } }$
C) $9 x$
D) $9 \sqrt [ 5 ] { x }$