Final answer:
An advertisement stating 'No elevator access' could violate fair housing laws as it potentially discriminates against individuals with disabilities, which is prohibited.
Step-by-step explanation:
The advertisement that would violate fair housing law is the one stating 'No elevator access.' This could be seen as discrimination against individuals with disabilities, which is prohibited under fair housing laws.
These laws, such as the Fair Housing Act in the United States, protect individuals from discrimination in housing based upon race, color, religion, sex, disability, familial status, or national origin.
Housing advertisements must not express a preference or limitation that excludes people from housing opportunities for these protected classes, and lack of elevator access in a multi-story dwelling could be a barrier for those with disabilities.