If a and b are odd integers, which of the following is an even integer? Pick one:
A) 3(2a+b)
B) 3(2a+b)+2a
C) 3(2a+b)+a+b
D) 3(2a+b)+7a-b
E) 3(2a+b)+ab
3(2a+b)+ab=odd(odd)+odd=odd+odd=even   The answer is 3(2a+b)+ab.
<result>E</result>
If a and b are odd integers, which of the following is an even integer?