Explanation

The pattern in the series is a decrease of 4, 8, 4, 2, ... (alternating between subtracting 4 and 8, then decreasing the subtraction by 2 each time).

Therefore, the next number in the series would be:

• 64 - 16 (4 + 8 + 4) = 48
• 48 - 8 (4 + 4) = 40
• 40 - 4 (4) = 36
• 36 - 2 (2) = 34
• 34 - 1 (1) = 33

So, the correct answer is: 33