Factor the Polynomial by Substitution $$8 x ^ { 4 } + 18 x ^ { 2 } + 9$$

Multiple Choice

Factor the polynomial by substitution.
- $$8 x ^ { 4 } + 18 x ^ { 2 } + 9$$

A) $\left( 4 x ^ { 2 } + 3 \right) \left( 2 x ^ { 2 } + 3 \right)$
B) $\left( 8 x ^ { 2 } + 3 \right) \left( x ^ { 2 } + 3 \right)$
C) $\left( 4 x ^ { 2 } - 3 \right) \left( 2 x ^ { 2 } - 3 \right)$
D) $\left( 4 x ^ { 2 } + 1 \right) \left( 2 x ^ { 2 } + 9 \right)$