Factor by Grouping $$12 a ^ { 3 } - 9 a ^ { 2 } b - 20 a b ^ { 2 } + 15 b ^ { 3 }$$

Multiple Choice

Factor by grouping.
- $$12 a ^ { 3 } - 9 a ^ { 2 } b - 20 a b ^ { 2 } + 15 b ^ { 3 }$$

A) $\left( 12 a ^ { 2 } - 5 b ^ { 2 } \right) ( a - 3 b )$
B) $\left( 3 a ^ { 2 } - 5 b \right) ( 4 a - 3 b )$
C) $\left( 3 a ^ { 2 } - 5 b ^ { 2 } \right) ( 4 a - 3 b )$
D) $\left( 3 a ^ { 2 } + 5 b ^ { 2 } \right) ( 4 a + 3 b )$