Factor Completely $x ^ { 2 } - 4 x - 45$

Multiple Choice

Factor completely. If the polynomial cannot be factored, write ʺprime.ʺ
- $x ^ { 2 } - 4 x - 45$

A) $( x - 5 ) ( x + 9 )$
B) $( x - 5 ) ( x + 1 )$
C) $( x + 5 ) ( x - 9 )$
D) Prime