Explanation

8, 22, 8,  28, 8, 34, 8, 40, 8, 46, 8, 52, 8, 58, 8, 62, 8, --------

Now add 6 with 22 or 28.

22 + 6 = 28

28 + 6 = 34.

So the answer is d = 34.