Question 393374
If y = 0 (mod 2) then y + 1 = 0 + 1 = 1 (mod 2), 


4y = 4(0) = 0 (mod 2)


4y + 1 = 4(0) + 1 = 1 (mod 2)


(d) makes no sense, it is already not an integer. Since (b) is the only integer 0 mod 2, it is the only number divisible by 2 and therefore, the only even integer.