Perform the Indicated Operations and Simplify $\left( - 2 x ^ { 3 } + 6 x ^ { 2 } - 4 x + 8 \right) + \left( 3 x ^ { 3 } + x - 4 \right)$

Multiple Choice

Perform the indicated operations and simplify. $\left( - 2 x ^ { 3 } + 6 x ^ { 2 } - 4 x + 8 \right) + \left( 3 x ^ { 3 } + x - 4 \right)$

A) $2 x ^ { 3 } + 6 x ^ { 2 } + 3 x + 5$
B) $2 x ^ { 3 } + 6 x ^ { 2 } + 3 x + 12$
C) $2 x ^ { 3 } + 6 x ^ { 2 } + 3 x - 1$
D) $x ^ { 3 } + 6 x ^ { 2 } + 3 x - 4$
E) $x ^ { 3 } + 6 x ^ { 2 } - 3 x + 4$