Purpose of Flashback in Literature

In various narratives, authors often employ flashbacks to provide context to a character's current situation. A flashback can reveal important details about past events that shape the character's motivations, emotions, or relationships. In one passage, a character suddenly recalls a moment from their childhood where they learned a painful lesson about trust. This moment is critical to understanding their current behavior in the narrative.

Which of the following statements best describes the purpose of this flashback?