Which of the following is NOT a signal of behavioral distress?

Guilt is a complex emotional response that can arise from various circumstances and does not inherently signify behavioral distress in the same way that the other options do. While it can be associated with distress, particularly when excessive or accompanied by other emotional issues, it is not strictly a behavioral symptom.

Increased aggression, substance abuse, and isolation are more direct indicators of behavioral distress. Increased aggression often reflects underlying frustration or inability to regulate emotions, substance abuse indicates coping mechanisms or escapism to deal with stress and emotional pain, and isolation typically signals withdrawal from social support systems, which can be a direct response to emotional turmoil or mental health challenges. These behaviors are more commonly recognized by professionals as signals that an individual may be experiencing significant distress or crisis.