Factor the Trinomial Completely $x ^ { 2 } - x - 45$

Multiple Choice

Factor the trinomial completely. If the polynomial cannot be factored, write "prime."
- $x ^ { 2 } - x - 45$

A) $( x + 5 ) ( x - 9 )$
B) prime
C) $( x - 5 ) ( x + 9 )$
D) $( x - 45 ) ( x + 1 )$