You are managing a multinational project from your office in Chicago. Half of your project team are from a foreign country but are living in Chicago while working on your project. These people inform you that two days during next week are national religious holidays in their country and they will be observing the holiday by not coming into work. 

You should:
A. Respect their beliefs and say nothing.
B. Force them to work because they are in the United States where their holiday is not celebrated.
C. Tell them that they must work non compensated overtime when they return to work in order to make up the lost time.
D. Remove them from the project team if possible.