You are answering a USMLE-style medical question. Question: A 38-year-old woman comes to the physician because of difficulty falling asleep for the past 2 months. She wakes up frequently during the night and gets up earlier than desired. She experiences discomfort in her legs when lying down at night and feels the urge to move her legs. The discomfort resolves when she gets up and walks around or moves her legs. She has tried an over-the-counter sleep aid that contains diphenhydramine, which worsened her symptoms. She exercises regularly and eats a well-balanced diet. She admits that she has been under a lot of stress lately. Her brother has similar symptoms. The patient appears anxious. Physical examination shows no abnormalities. A complete blood count and iron studies are within the reference range. Which of the following is the most appropriate pharmacotherapy for this patient's symptoms? Options: A) Amitryptiline B) Pramipexole C) Codeine D) Escitalopram Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.