Look at this series: 3, 4, 8, 11, 12
What number should come next?
I. 7
II. 10
III. 14
IV. 15
Question: 以下哪项是正确的？
Options:
A. 仅 II
B. III 或 I
C. IV 或 I
D. 仅 IV
E. 非 III
Answer: C
D
E
True statement: IV