What piece of information about a property is prohibited from disclosure to a prospective buyer?

The piece of information that is prohibited from disclosure to a prospective buyer is related to the religious affiliation of the neighbors. This restriction is rooted in fair housing laws, which aim to prevent discrimination based on various factors, including religion. Disclosing the religious beliefs or affiliations of neighbors could potentially lead to bias or discrimination against certain groups, thus violating the principles of equal housing opportunity.

In contrast, other options involve issues that pertain directly to the condition of the property or environmental hazards. For example, information regarding asbestos insulation or mold caused by floodwater in the basement is critical for a buyer to make an informed decision regarding the property’s safety and health risks. These disclosures fall under the duty of sellers and agents to provide material facts that could impact the buyer's purchase decision. While a death occurring in the property may be sensitive information, it is often considered permissible to disclose, depending on local laws and regulations; however, it does not fall under the same protection as the prohibition on disclosing religious affiliations.