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