Type D personality, also known as the "distressed" personality type, is associated with higher risk factors for both psychological and physical health problems, including depression and heart disease.
Type D personality, as defined by Morris and others, is characterized by a high degree of negative emotions (such as sadness, anxiety, and irritability) and social inhibition. People with type D personality are more likely to experience stress and emotional distress, which makes them prone to conditions like depression. Therefore, the correct answer is "Prone to depression."