Factor the Trinomial Completely $x ^ { 2 } + 6 x + 9$

Multiple Choice

Factor the trinomial completely. $x ^ { 2 } + 6 x + 9$

A) $( x + 3 ) ^ { 2 }$
B) $( x + 3 ) ( x - 3 )$
C) $( x - 3 ) ^ { 2 }$
D) $( x + 9 ) ( x + 1 )$
E) not factorable