The pattern alternates between adding 3 and subtracting 2.
- 07 + 3 = 10 - 10 - 2 = 08 - 08 + 3 = 11 - 11 - 2 = 09 - 09 + 3 = 12 - 12 - 2 = 10 (so the next number in the sequence is 13).
Thus, the next number in the series is 13.
The correct answer is "13."