State laws can differ on a buyer's entitlement to know about what type of event?

The correct choice focuses on the sensitive nature of certain events that may have occurred in a property, such as a suicide. In many states, including Pennsylvania, disclosure laws regarding stigmatized property conditions—like deaths or crimes associated with a property—varies significantly. Sellers might be obligated to disclose such information depending on local laws and the time elapsed since the event.

In contrast, the other options pertain to physical changes or market conditions that are typically straightforward and do not involve the personal or sensitive nature that the question emphasizes. Recent remodeling, additions, or increases in property value are generally objective facts that buyers are expected to know and sellers are often required to disclose as part of typical property conditions. The potential impact of stigmatizing events on a buyer's decision makes this type of information particularly important, thus justifying the variation in laws regarding disclosure.