Perform the Indicated Operations and Simplify $( 5 x ) ^ { 3 } \left( 4 x ^ { 3 } \right)$

Multiple Choice

Perform the indicated operations and simplify. $( 5 x ) ^ { 3 } \left( 4 x ^ { 3 } \right)$

A) $507 x ^ { 6 }$
B) $500 x ^ { 10 }$
C) $502 x ^ { 9 }$
D) $500 x ^ { 6 }$
E) $505 x ^ { 6 }$