Factor by Grouping $x ^ { 2 } - 4 x - 3 x + 12$

Multiple Choice

Factor by grouping.
- $x ^ { 2 } - 4 x - 3 x + 12$

A) $( x - 3 ) ( x + 8 )$
B) $( x + 3 ) ( x - 4 )$
C) $- 7 x \left( x ^ { 2 } + 12 \right)$
D) $( x - 3 ) ( x - 4 )$