Use Substitution to Factor the Polynomial Completely $15 x ^ { 4 } + 19 x ^ { 2 } + 6$

Multiple Choice

Use substitution to factor the polynomial completely.
- $15 x ^ { 4 } + 19 x ^ { 2 } + 6$

A) $\left( 5 x ^ { 2 } - 3 \right) \left( 3 x ^ { 2 } - 2 \right)$
B) $\left( 15 x ^ { 2 } + 2 \right) \left( x ^ { 2 } + 3 \right)$
C) $\left( 3 x ^ { 2 } + 2 \right) \left( 5 x ^ { 2 } + 3 \right)$
D) $\left( 3 x ^ { 2 } + 1 \right) \left( 5 x ^ { 2 } + 6 \right)$