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

Multiple Choice

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

A) $\sqrt [ 7 ] { 3 x ^ { 3 } }$
B) $\sqrt [ 7 ] { 27 x ^ { 3 } }$
C) $3 \sqrt [ 7 ] { x ^ { 3 } }$
D) $\sqrt [ 3 ] { 3 x ^ { 7 } }$