Which situation is considered to be discriminatory under the federal Fair Housing Act in U.S?

A. A Catholic church provides rooms to only Catholics.

B. The Optimist's Club will only rent rooms to persons who are members of this private club.

C. The owner of an apartment building near a college rents only to females

D. The owner of a 2-unit building lives in one unit and refuses to rent the adjoining in to families with children.