Find the Missing Monomial, Factor or Term $( x + ? ) ( x + ? ) = x ^ { 2 } + 9 x + 18$

Find the missing monomial, factor or term.
- $( x + ? ) ( x + ? ) = x ^ { 2 } + 9 x + 18$

A) $- 3 , - 6$
B) 3,6
C) $- 3,6$
D) $3 , - 6$