Multiply the Following $\left( 7 x ^ { 2 } \right) ( 9 x ) \left( 8 x ^ { 3 } \right)$

Multiple Choice

Multiply the following. $\left( 7 x ^ { 2 } \right) ( 9 x ) \left( 8 x ^ { 3 } \right)$

A) $509 x ^ { 5 }$
B) $504 x ^ { 6 }$
C) $504 x ^ { 5 }$
D) $499 x ^ { 5 }$
E) $507 x ^ { 6 }$