Factor the Trinomial Completely $r ^ { 2 } - 4 r - 5$

Multiple Choice

Factor the trinomial completely. $r ^ { 2 } - 4 r - 5$

A) $( r + 5 ) ( r + 1 )$
B) $( r - 5 ) ( r + 1 )$
C) $( r + 5 ) ( r - 1 )$
D) $( r - 5 ) ( r - 1 )$
E) not factorable