An elderly couple who lived in the same home for the past 50 years have moved into an adult retirement center in a nearby town. Changes in lifestyle such as this couple is experiencing should alert the nurse to the possibility of:

The correct answer is D: Adventitious crisis. This type of crisis is triggered by external events such as moving to a retirement center after 50 years in the same home. The sudden change in environment can lead to distress and challenges for the elderly couple, causing an adventitious crisis. Acute grief (A) and traumatic grief (B) are typically associated with the loss of a loved one, not a change in lifestyle. Chronic sorrow (C) refers to ongoing grief related to a chronic illness or disability, which is not the case in this scenario.