Look at this series: 75, 65, 85, 55, ____, 85, 35
What number should fill the blank?
I. 25
II. 45
III. 65
IV. 85

Question: 以下哪项是正确的？
Options:
A. 以上各项均不成立, B. III 或 I, C. 仅 III, D. I 或 III, E. 仅 II
Answer: E
True statement: II