Final answer:
Stress can be caused by both positive and negative life events, depending on a person's subjective appraisal of the event.
Step-by-step explanation:
Stress can be caused by both positive and negative life events. Whether a life event is perceived as positive or negative by an individual depends on their subjective appraisal of the event. If a person appraises an event as harmful and believes that the demands imposed by the event exceed their available resources, they will experience stress. This means that even positive events such as getting married or retiring can cause stress.