5
7
8
11
Answer is Wrong!
Answer is Right!
The answer is $\boxed{7}$.
The sequence is a simple alternating subtraction and addition of 1, starting with 8. The first number is 8, then 9, then 8 minus 1 is 7, then 10, then 9 plus 1 is 10, then 6, then 11, then 10 plus 1 is 11, and finally 12.
Option A, 5, is incorrect because it is not in the sequence.
Option B, 7, is the correct answer because it is the next number in the sequence after 10.
Option C, 8, is incorrect because it is already in the sequence.
Option D, 11, is incorrect because it is the number before the answer.