The correct answer is A. 12 Hours.
The additional hours for Gate man C saloon attendant, care takers will be 12 hours. This is because they are required to work 12 hours on a daily basis, which is 2 hours more than the regular working hours of 8 hours.
Option B is incorrect because it states that the additional hours will be 8 hours. This is not correct because the regular working hours are 8 hours, and the additional hours are 12 hours.
Option C is incorrect because it states that the additional hours will be 24 hours. This is not correct because the regular working hours are 8 hours, and the additional hours are 12 hours.
Option D is incorrect because it states that the additional hours will be 16 hours. This is not correct because the regular working hours are 8 hours, and the additional hours are 12 hours.