Factor by Grouping $$20 x ^ { 6 } - 25 x ^ { 3 } - 12 x ^ { 3 } + 15$$

Multiple Choice

Factor by grouping.
- $$20 x ^ { 6 } - 25 x ^ { 3 } - 12 x ^ { 3 } + 15$$

A) $\left( 5 x ^ { 6 } - 3 \right) ( 4 x - 5 )$
B) $\left( 5 x ^ { 3 } + 3 \right) \left( 4 x ^ { 3 } + 5 \right)$
C) $\left( 5 x ^ { 3 } - 3 \right) \left( 4 x ^ { 3 } - 5 \right)$
D) $\left( 20 x ^ { 3 } + 3 \right) \left( x ^ { 3 } + 5 \right)$