Completely Factor the Polynomial or State That the Polynomial Is $15 x ^ { 4 } + 29 x ^ { 2 } + 12$

Multiple Choice

Completely factor the polynomial or state that the polynomial is prime.
- $15 x ^ { 4 } + 29 x ^ { 2 } + 12$

A) $\left( 3 x ^ { 2 } + 4 \right) \left( 5 x ^ { 2 } + 3 \right)$
B) $\left( 15 x ^ { 2 } + 4 \right) \left( x ^ { 2 } + 3 \right)$
C) $\left( 3 x ^ { 2 } + 1 \right) \left( 5 x ^ { 2 } + 12 \right)$
D) $\left( 5 x ^ { 2 } - 3 \right) \left( 3 x ^ { 2 } - 4 \right)$