A 28-year-old woman reports chronic low mood for 2 years, with poor appetite, fatigue, and hopelessness, but never meets full criteria for major depression. What is the most likely diagnosis?

Correct option is B

Dysthymia (Persistent Depressive Disorder) = chronic depressive symptoms for ≥2 years without full major depressive episodes.
Explanation of options: (a) ✘ Cyclothymia = fluctuating hypomania + mild depression. (b) ✔ Correct; long-term subthreshold depression = dysthymia. (c) ✘ Bipolar II requires hypomania + major depression. (d) ✘ Somatization = multiple physical complaints, not persistent low mood.