Final answer:
The symptom least likely to occur in a soldier who was exposed to combat and wounded by an explosion is d)feelings of persecution. This is less commonly associated with combat-related PTSD than other symptoms such as depression, hypervigilance, or insomnia.
Step-by-step explanation:
The symptom that is least likely to occur in a soldier who has been exposed to numerous combat situations, including an explosion that seriously wounded him, is d. feelings of persecution. Soldiers returning from combat often suffer from a range of psychological issues as a result of the severe trauma they have faced. Common symptoms observed include depression, hypervigilance, and insomnia, all of which are associated with Post Traumatic Stress Disorder (PTSD). Feelings of persecution, while it can occur in some forms of mental health conditions, is less commonly reported as a direct result of combat-related PTSD than the other symptoms listed.