Which type of stressor is included in non-combat PTSD cases?

In the context of non-combat PTSD, the correct answer identifies stressors that can lead to trauma without direct engagement in combat situations. Experiencing an explosion is a significant stressor as it can occur in various contexts, including non-combat situations. For instance, someone might be present near an explosion during their service, which can invoke intense fear, helplessness, or horror, leading to PTSD.

Non-combat PTSD can stem from a variety of experiences that do not necessarily involve direct combat, yet remain highly distressing. The other options listed—witnessing combat death, engaging in ground combat, and serving in a combat zone—all pertain to direct combat experiences that are closely related to military action and traditional definitions of combat-related PTSD. While they can be highly traumatic, they do not encompass cases categorized as non-combat PTSD, where the trauma arises from situations not involving direct engagement or active combat scenarios.