Find the LCM $x ^ { 2 } - 9 x + 20 , x ^ { 2 } - 3 x - 4$

Multiple Choice

Find the LCM.
- $x ^ { 2 } - 9 x + 20 , x ^ { 2 } - 3 x - 4$

A) $( x - 4 ) ( x + 1 )$
B) $( x - 5 ) ( x - 4 )$
C) $( x - 5 ) ( x - 4 ) ( x + 1 )$
D) $( x + 5 ) ( x + 4 ) ( x + 1 )$