What facts contribute to Oedipus’s suspicion regarding Laius' murder?

Oedipus's suspicion regarding Laius' murder is primarily influenced by his past actions and proximity to the site of the murder. He admits to having killed several men at a crossroads, which raises questions about whether he might have killed Laius under the impression he was acting in self-defense during a confrontation. His awareness of having been involved in violent encounters near the location of Laius' murder amplifies his concerns, creating a credible connection between his actions and the crime. This leads him to investigate further and piece together the circumstances surrounding Laius’ death.

In contrast, the other options do not contribute effectively to Oedipus's suspicion. A vision before the murder is not part of the narrative, while overhearing a conversation does not provide concrete evidence to fuel his suspicions. Finding weapons at the murder site could imply foul play, but it does not directly link Oedipus to the act as powerfully as his own admission of having killed men nearby. Thus, the combination of personal involvement and geographical proximity significantly shapes his suspicion regarding Laius's murder.