Acute pancreatitis with peripancreatic stranding and swollen gland

A 40-year-old man with gallstone disease presents with 12 hours of severe epigastric pain radiating to the back, vomiting, and inability to tolerate oral intake. Examination reveals epigastric tenderness and mild jaundice. Lipase is 1420 U/L (>5× ULN) and total bilirubin is 3.2 mg/dL. Contrast-enhanced CT at 72 hours shows a diffusely enlarged edematous pancreas. The finding marked **B** in the diagram—hazy peripancreatic fat stranding extending into the anterior pararenal space—is consistent with which stage of acute pancreatitis according to the Revised Atlanta Classification?