A 55-yeаr-оld mаle frоm Sоutheаst Asia is visiting his son in the U.S. for several months. While here, he loses weight. He starts to develop abdominal pain, anorexia, and increased abdominal girth. His son takes him to the family doctor. On physical examination, ascites is present and his liver is enlarged. Interestingly, he is not jaundiced. Additional laboratory results are as follows: TEST RESULTS REFERENCE RANGE AST 134 IU/L 5-40 IU/L ALT 121 IU/L 5-35 IU/L Bilirubin (total) 2.8 mg/dL 0.2-1.5 mg/dL Alkaline phosphatase 113 U/L 20-70 U/L A liver biopsy is done, and he is found to have as. Which of the following viruses is associated with the development of hepatocellular carcinoma?