Final answer:
The difference of 3 consecutive even integers is always even.
Step-by-step explanation:
The difference of 3 consecutive even integers can be found by subtracting the first even integer from the third even integer.
Since the integers are consecutive even numbers, they can be represented as n, n+2, and n+4.
Therefore, the difference between the third and first even integers would be (n+4) - n = 4.
Hence, the difference of 3 consecutive even integers is always even (option a).