Find the missing number?

9
8
10
11

The missing number is 10.

The numbers in the sequence are all multiples of 3, except for the missing number. The missing number must be a multiple of 3 that is also less than 14. The only multiple of 3 that fits this criteria is 10.

A. 9 is not a multiple of 3.
B. 8 is not a multiple of 3.
C. 10 is a multiple of 3 and is less than 14.
D. 11 is not a multiple of 3.