Factor Completely $320 x ^ { 3 } + 240 x ^ { 2 } + 45 x$

Multiple Choice

Factor completely. $320 x ^ { 3 } + 240 x ^ { 2 } + 45 x$

A) $\left( 40 x ^ { 2 } + 15 \right) ( 8 x + 3 )$
B) $5 x ( 8 x + 3 ) ( 8 x + 3 )$
C) $5 x ( 8 x - 3 ) ( 8 x - 3 )$
D) $\left( 40 x ^ { 2 } + 15 \right) ( 8 x + 3 )$
E) Not factorable