Factor the Polynomial Using the Greatest Common Binomial Factor $x ( x + 3 ) + 6 ( x + 3 )$

Multiple Choice

Factor the polynomial using the greatest common binomial factor.
- $x ( x + 3 ) + 6 ( x + 3 )$

A) $\left( x ^ { 2 } + 3 x \right) ( 6 x + 18 )$
B) $( x - 3 ) ( x - 6 )$
C) $( x + 3 ) ( x + 6 )$
D) $\left( x ^ { 2 } + 3 \right) \left( x ^ { 2 } + 6 \right)$