According to Holmes and Rahe's stressful life events scale, the order of stress levels is as follows:
- A. Death of a close family member is considered the most stressful life event, given its significant emotional and psychological impact.
- B. Unexpected accident or trauma also scores high in terms of stress because of the sudden and unexpected nature of the event.
- D. Change in eating habits is a moderate stressor, usually resulting from lifestyle changes or health-related issues.
- C. Appearing for examination is considered a low-stress event in comparison to the others listed here.
Thus, the correct order is A, B, D, C.