Diagnosis of Generalized Anxiety Disorder

A 32-year-old woman presents to her primary care physician with a 3-month history of increasingly severe anxiety that has interfered with her job performance and her social relationships. She finds herself worrying excessively about various aspects of her life, including work, health, and family. This excessive worrying occurs more days than not and is difficult for her to control. The physician notes that she has physical symptoms such as muscle tension and difficulty sleeping. Aside from this, her physical examination is unremarkable, and she reports no history of manic episodes or depressive episodes.

Based on this case, which of the following diagnoses is most consistent with her symptoms?