If n is an integer, which of the following must be an even integer?
Pick one:	A) n^2-n-1	B) n^2-4n+6	C) n^2-5n+5	D) n^2+3n+8	E) n^2+2n+10
Check the options by plugging in some values ( Preferably smaller integers like 1 and 2 )   A: n^2-n-1 = -1 { If n = 1 }   B: n^2-4n+6 = 3 { If n = 1 }   C: n^2-5n+5 = 1 { If n = 1 }   n^2+3n+8: n^2+3n+8 = 12 { If n = 1 }n^2+3n+8 = 18 { If n = 2 }   E: n^2+2n+10 = 13 { If n = 1 }   Thus the only possible answer is (n^2+3n+8)
<result>D</result>
If n is an integer, which of the following must be an even integer?