Factor Assume That Variables Used as Exponents Represent Positive Integers $$x ^ { 2 n } + 11 x ^ { n } + 18$$

Multiple Choice

Factor. Assume that variables used as exponents represent positive integers.
- $$x ^ { 2 n } + 11 x ^ { n } + 18$$

A) $\left( x ^ { n } - 9 \right) \left( x ^ { n } + 1 \right)$
B) $\left( x ^ { n } + 9 \right) \left( x ^ { n } + 2 \right)$
C) $\left( x ^ { n } - 9 \right) \left( x ^ { n } + 2 \right)$
D) prime polynomial