Correct option is D) a+2b
If a is an odd integer and b is an even integer, a+2b is an odd integer.
Even numbers are ones that can be divided into two equal parts, but odd numbers cannot be divided into two equal parts.
If a is odd and b is even, then
A. 3b=3×even=even
B. a+3=odd+odd=even
C.2(a+b)=2×(odd+even)=2(odd)=even
D. a+2b=odd+2(even)=odd+even=odd
E. 2a+b=2(odd)+even=even+even=even
Hence 'D' is the correct choice.
To know more about odd and even numbers, visit: https://brainly.com/question/17178884
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