Which of the following situations would be exempt under the Fair Housing Act?
A.A religious organization refuses to allow people of a particular national origin to spend the night in its temporary crisis housing
B.An elderly homeowner who rents out a room in her house asks that no people of a particular national origin apply, in her classified ad
C.The owner of a fourplex lives in one unit and refuses to rent the other three units to students because of their national origin
D.The owner of a house refuses to sell the property to buyers because of their national origin, after his real estate agent confirms that is allowed