Perform the Indicated Operations and Simplify $\left( - 2 x ^ { 3 n } + 2 x ^ { 2 n } - 4 x ^ { n } \right) - \left( 5 x ^ { 2 n } + 3 x ^ { n } - 2 \right)$

Multiple Choice

Perform the indicated operations and simplify. Assume that all exponents represent positive integers. $\left( - 2 x ^ { 3 n } + 2 x ^ { 2 n } - 4 x ^ { n } \right) - \left( 5 x ^ { 2 n } + 3 x ^ { n } - 2 \right)$

A) $- 2 x ^ { 3 n } - 3 x ^ { 2 n } - 7 x ^ { n } + 2$
B) $- 7 x ^ { 3 n } - 3 x ^ { 2 n } - 7 x ^ { n } + 2$
C) $- 7 x ^ { 3 n } - x ^ { 2 n } - 2 x ^ { n } - 2$
D) $- 2 x ^ { 3 n } + 7 x ^ { 2 n } - x ^ { n } - 2$
E) $- 7 x ^ { 3 n } - x ^ { 2 n } - 2 x ^ { n }$