Factor the Four-Term Polynomial by Grouping $x ^ { 3 } + 7 x + x ^ { 2 } + 7$

Multiple Choice

Factor the four-term polynomial by grouping.
- $x ^ { 3 } + 7 x + x ^ { 2 } + 7$

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