Which disorder involves symptoms like reliving traumatic events and nightmares?

Post-Traumatic Stress Disorder (PTSD) is characterized by recurring, distressing memories or flashbacks of traumatic events, vivid nightmares, and significant emotional distress related to those memories. Individuals with PTSD may experience heightened anxiety, avoiding reminders of the trauma, changes in mood, and difficulty functioning in daily life due to these intrusive symptoms. This disorder often follows exposure to an event that involves actual or threatened death, serious injury, or sexual violence.

The other options do not fit this description. Neurodiversity refers to the range of neurological conditions in the population and emphasizes understanding and accepting these differences rather than focusing on disorders. Speech disorders pertain to difficulties in communication and do not typically involve the reliving of traumatic experiences. Obsessive-Compulsive Disorder, while it can involve distressing thoughts and repetitive behaviors, is primarily focused on intrusive thoughts (obsessions) and compulsions rather than trauma-related experiences. Thus, PTSD is the accurate answer based on the symptoms described.