Answer:
a. post-traumatic stress disorder
Explanation:
Post-traumatic stress disorder: In abnormal psychology, the term post-traumatic stress disorder is also referred to as PTSD. PTSD is a mental illness or mental health condition that can be caused due to terrifying incidents in life by either witnessing or experiencing it.
Symptoms: Severe anxiety, flashbacks, uncontrollable thoughts, and nightmares about the event.
Events associated with PTSD:
1. Serious accidents.
2. Sexual or physical assault.
3. Abuse (childhood or domestic).
4. Exposure to traumatic events.