Factor Out the Greatest Common Factor $15 x ^ { 6 } + 6 x ^ { 3 } - 20 x ^ { 3 } - 8$

Multiple Choice

Factor out the greatest common factor. Simplify the factors, if possible.
- $15 x ^ { 6 } + 6 x ^ { 3 } - 20 x ^ { 3 } - 8$

A) $\left( 15 x ^ { 3 } + 4 \right) \left( x ^ { 3 } - 2 \right)$
B) $\left( 3 x ^ { 6 } - 4 \right) ( 5 x + 2 )$
C) $\left( 3 x ^ { 3 } - 4 \right) \left( 5 x ^ { 3 } + 2 \right)$
D) $\left( 3 x ^ { 3 } + 4 \right) \left( 5 x ^ { 3 } - 2 \right)$