A broker who insisted a walking-impaired tenant rent a lower floor unit because of safety reasons:

The correct answer is: in violation of the Federal Fair Housing laws.

Explanation:

Under the Federal Fair Housing Act of 1988, landlords are forbidden to refuse the rent or sale of a property due to race, color, disability, sex, family status, or nationality. The Act is part of an amendment to the Civil Rights Act of 1968 about discrimination on renting, selling or financing a house.

Matters such as safety, even not in his or her favor, rely on the tenant ore than on the landlord unless a legal case states the opposite in particular.