Find the Missing Monomial, Factor or Term $) ^ { 2 } = x ^ { 2 } + 24 x + 144$

Find the missing monomial, factor or term.
-(?) $) ^ { 2 } = x ^ { 2 } + 24 x + 144$

A) $- x + 12$
B) $x - 12$
C) $x ^ { 2 } + 12$
D) $x + 12$