An adult patient reports a depressed mood for the past 6 months. They report good energy levels, but early morning awakenings. The patient denies guilty ruminations and continues to enjoy their hobbies. They deny all other symptoms of depression but the depressive symptoms do tend to cause distress. What is the correct diagnosis?
A. Unspecified depressive disorder
B. Normal middle adulthood
C. Persistent depressive disorder
D. Major depressive disorder