The correct option is A 12
Multiples of 2 are 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, ...
Multiples of 3 are 3, 6, 9, 12, 15, 18, 21, 24, …
Multiples of 6 are 6, 12, 18, 24, …
So, common multiples of 2, 3 and 6 are 6, 12, 18, 24, …
Therefore, common multiples of 2, 3 and 6 among the given options is 12..