Find the missing number?

3
4
5
6

The missing number is 4.

The numbers in the sequence are all the even numbers from 2 to 12, except for 4.

A. 3 is not an even number.
B. 4 is the missing number.
C. 5 is an even number, but it is not the missing number.
D. 6 is an even number, but it is not the missing number.