Factor the Four-Term Polynomial by Grouping $12 a ^ { 3 } + 18 a ^ { 2 } b - 10 a b ^ { 2 } - 15 b ^ { 3 }$

Multiple Choice

Factor the four-term polynomial by grouping.
- $12 a ^ { 3 } + 18 a ^ { 2 } b - 10 a b ^ { 2 } - 15 b ^ { 3 }$

A) $\left( 12 a ^ { 2 } - 5 b ^ { 2 } \right) ( a + 3 b )$
B) $\left( 6 a ^ { 2 } + 5 b ^ { 2 } \right) ( 2 a - 3 b )$
C) $\left( 6 a ^ { 2 } - 5 b \right) ( 2 a + 3 b )$
D) $\left( 6 a ^ { 2 } - 5 b ^ { 2 } \right) ( 2 a + 3 b )$