Look at this series: 2, 5, 28, 8, ____, 20, 14, 17
What number should fill the blank?
I. 11
II. 17
III. 20
IV. 28
Question: 以下哪项是正确的？
Options:
A. 仅 IV, B. 仅 III, C. I 为真, D. 以上各项均不成立
Answer: C