Factor $c ^ { 2 } + 6 c + 9$

Multiple Choice

Factor: $c ^ { 2 } + 6 c + 9$

A) $( c + 3 ) ( c - 3 )$
B) $( c - 3 ) ^ { 2 }$
C) $( c + 3 ) ^ { 2 }$
D) $( 3 + c ) ( 3 - c )$
E) Nonfactorable over the integers