Answer: b. must decline to take the listing with this requirement
Explanation: A real estate professional must not take any listing with discriminatory requirement based on race such as the requirement made by the seller in the scenario above. This in accordance with the Fair Housing Act which prohibits acts of discrimination in housing based on color, religion, race, sex or nationality. A listing stating that an apartment or property shouldn't be offered to individuals who aren't nationals of the United States has discriminated on the basis of nationality which is illegal.
