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