Which of the following is a sign of unusual conversations during an encounter?

Proposing suspicious trade deals is considered a sign of unusual conversations during an encounter because it may indicate illicit or fraudulent activities. Such discussions often involve offers that do not align with normal economic practices or that raise questions about legality or ethics. This behavior can signal that the individuals involved might be attempting to engage in unlawful transactions or schemes that could pose a risk to the public or law enforcement.

In contrast, chatting about the local weather, mutual acquaintances, or planning community events typically reflects ordinary and benign social interactions. These types of discussions are common in everyday life and do not inherently raise concerns about suspicious behavior or intent. Thus, they do not qualify as signs of unusual conversations in the context of law enforcement encounters.