Use Radical Notation to Write the Expression $( 7 x ) ^ { 3 / 10 }$

Multiple Choice

Use radical notation to write the expression. Simplify if possible.
- $( 7 x ) ^ { 3 / 10 }$

A) $\sqrt [ 10 ] { 343 x ^ { 3 } }$
B) $\sqrt [ 10 ] { 7 x ^ { 3 } }$
C) $\sqrt [ 3 ] { 7 x ^ { 10 } }$
D) $7 \sqrt [ 10 ] { \mathrm { x } ^ { 3 } }$