Write the Polynomial $x ^ { 4 } - 7 x ^ { 2 } - 8$

Multiple Choice

Write the polynomial $x ^ { 4 } - 7 x ^ { 2 } - 8$ as the product of factors that are irreducible over the rationals.

A) $\left( x ^ { 2 } - 8 \right) \left( x ^ { 2 } - 1 \right)$
B) $\left( x ^ { 2 } - 8 \right) \left( x ^ { 2 } + 1 \right)$
C) $\left( x ^ { 2 } + 8 \right) \left( x ^ { 2 } + 1 \right)$
D) $\left( x ^ { 2 } + 8 \right) \left( x ^ { 2 } - 1 \right)$
E) $\left( x ^ { 2 } - 7 \right) \left( x ^ { 2 } - 1 \right)$