Which of the following must a seller disclose to the buyer?

The correct choice is lead paint because it is a federally mandated disclosure for residential properties that were built before 1978. The EPA (Environmental Protection Agency) requires sellers to inform buyers of any known lead-based paint hazards. This is critical for protecting the health of potential buyers, particularly young children who are more susceptible to the dangers of lead poisoning. Sellers must provide a lead hazard information pamphlet, any available records or reports regarding lead-based paint, and include specific language in the purchase and sale agreement that states the buyer has been made aware of these risks.

The other options, while important, do not carry the same legal requirement for disclosure. Personal property insurance is typically a private matter for the seller and does not need to be disclosed to potential buyers. Neighborhood disputes are often subjective and can vary widely; therefore, they are not mandated disclosures unless they directly affect the property. Homeowner association fees are important for buyers to know but are typically disclosed through the HOA and not directly by the seller as a legal requirement. Understanding these nuances in disclosure laws is crucial for both sellers and buyers in real estate transactions.