A 45-year-old obese woman with cholelithiasis presents to the emergency room complaining of nausea and vomiting for 2 days, along with severe continuous midabdominal pain.She has a low-grade fever and the ER physician finds that she has a slightly elevated WBC count (12,000) and an elevated serum amylase.The most likely diagnosis is (2.0分)
选项：

A:
A:Ruptured abdominal aortic aneurysm
B:
B:Hepatitis
C:
C:Peptic ulcer disease
D:
D:Early phase of acute appendicitis
E:
E:Acute pancreatitis