A 68-year-old woman from Delhi presents with acute RUQ pain, fever (38.5°C), and jaundice. Laboratory findings show elevated conjugated bilirubin, ALP 320 U/L, and GGT 280 U/L. An MRCP is performed showing a 12 mm stone impacted in the structure marked C in the diagram, with upstream ductal dilation. Which of the following is the most appropriate next step in management?

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