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Answer: C - Iran and many other nations with a predominantly Muslim population do not conduct business on Fridays or on Thursday afternoons. Friday is the day of weekly religious observance in Islam. A similar observance is made by most nations according to the predominant faith of its people; U.S. banks are generally open on Saturday morning and closed on Sundays because the Christian Sabbath is on Sunday. This means that most business and economic communication between the United States and Muslim nations occurs Monday thru Wednesday, when all parties have full working days.