Which advertising statement could potentially violate fair housing laws?

The statement "Upgrading community" could potentially violate fair housing laws because it may imply a preference for higher-income individuals or families based on socioeconomic status. Fair housing laws are designed to prevent discrimination based on race, color, religion, sex, national origin, familial status, or disability. By suggesting an "upscale" nature of a community, it could be interpreted as attracting and favoring affluent buyers or renters, thus unintentionally excluding those of lower income or socioeconomic backgrounds.

In contrast, the other statements also raise concerns but in the context of various discriminatory practices. "Married couples only" specifically targets familial status, which could lead to exclusion of single individuals or unmarried couples, and "No children allowed" directly discriminates against families with children, violating fair housing protections around familial status. The mention of "In St. Patrick's parish" could suggest a preferential treatment based on religion, but it may not communicate a direct preference in the same way as "upscale community" does in relation to socioeconomic class.

Therefore, the phrasing of "upscale community" ties closely to socioeconomic discrimination, which makes it a more clear potential violation of fair housing laws.