A 43-year-old woman has a 3-month history of gradually increasing abdominal distention andjaundice. She has no other symptoms, and her medical history is noncontributory. On physical examination, the patient has jaundice, palmar erythema, and spider angiomata. Abdominal examination discloses hepato splenomegaly and moderate ascites. Aspartate aminotransferase 53 U/L Alanine aminotransferase 47 U/L Alkaline phosphatase 123 U/L Total bilirubin 3.2 mg/dL (54.7 umol/L) Albumin 2.9 g/dL (29 g/) Abdominal ultrasonography shows hepatomegaly, a coarse echotexture of the liver, patent portal and hepatic veins, mild splenomegaly, moderate ascites, and no bile duct dilatation. Paracentesisisperformed. The ascitic fluid leukocyte count is 80/ul, and albumin is 0.7 g/dL (7 g/L). Gram stain and culture are pending. Which of the following is the most likely cause of the ascites?