You are answering a USMLE-style medical question. Question: A 45-year-old woman is brought to the emergency department by her husband due to upper abdominal pain, nausea, and vomiting for the past couple of hours. She had similar episodes in the past, which were often precipitated by food but resolved spontaneously. Her temperature is 38.3°C (101.0°F), heart rate is 96/min, blood pressure is 118/76 mm Hg, and respiratory rate is 16/min. Physical examination reveals tenderness over the right upper quadrant that is severe enough to make her stop breathing when deeply palpated in the area. Lab results show: Leukocyte count 18,000/mm3 with 79% neutrophils Aspartate aminotransferase 67 IU/L Alanine aminotransferase 71 IU/L Serum amylase 46 U/L Serum Lipase 55 U/L Serum calcium 8.9 mg/dL Ultrasonography of the abdomen is shown below. During the ultrasound exam, the patient complains of tenderness when the probe presses down on her right upper quadrant. Which of the following is the most likely cause of her pain? Options: A) Acute calculous cholecystitis B) Acute acalculous cholecystitis C) Acute pancreatitis D) Ascending cholangitis Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.