Which of the following phrases in a rental ad may be permissible

This phrase is not permissible as it specifically excludes families with younger children, which can be seen as discriminatory. Fair housing laws prohibit discrimination against families with children, therefore, setting an age limit on children is typically not allowed in rental advertisements.

This phrase is also impermissible as it suggests exclusion based on age, which could be interpreted as discriminating against younger adults or families. Rental ads that limit occupancy to adults only can violate fair housing regulations that are designed to protect against age-based discrimination.

This phrase is problematic as it implies a restriction based on relationship status, potentially excluding single individuals and families. Such discriminatory language can be challenged under fair housing laws, which aim to prevent bias against individuals based on their marital or familial status.