You are answering a USMLE-style medical question. Question: A 21-year-old woman presents to the emergency room with right arm pain and limited range of motion. She does not recall trauma to the arm. She also complains of diarrhea and nausea. She is sexually active with one male partner and admits to having pain during intercourse. There is vague and diffuse tenderness to palpation in all four abdominal quadrants. No erythema or edema is noted on the right arm. The fecal occult test is negative. Past records show that this patient has been in the ER 7 times in the past year with similar symptoms. Which of the following is the most likely diagnosis? Options: A) Ulcerative colitis B) Illness anxiety disorder C) Somatization disorder D) Somatoform pain disorder Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.