Factor Completely $50 a ^ { 4 } b - 18 b ^ { 3 }$

Multiple Choice

Factor completely.
- $50 a ^ { 4 } b - 18 b ^ { 3 }$

A) $2 b \left( 5 a ^ { 2 } + 3 b \right) \left( 5 a ^ { 2 } - 3 b \right)$
B) $2 b ( 5 a - 3 b ) ^ { 2 }$
C) Prime
D) $2 b ( 5 a + 3 b ) ^ { 2 }$