The correct answer is letter D
Stress means experiencing situations that are perceived as threatening our physical or psychological well-being. These situations are often called stressors, and people's reactions to them are called stress responses.
Situations perceived as stressful generally fall into one or more of the following categories: traumatic events, uncontrollable events, events that challenge the limits of our capacity and our self-concept, or internal conflicts.
The clearest sources of stress are traumatic events, situations of extreme danger that are outside the usual range of human experience. This includes natural disasters, such as earthquakes and floods; man-made disasters, such as wars and nuclear accidents, catastrophic accidents, such as car or airplane collisions; and physical attacks, etc.
