Predominant blood supply to the supraduodenal bile duct is derrived from:

• A. Vessels that run downward along the bile duct from the hepatic end of the duct such as the right hepatic artery
• B. Vessels that arise from the hepatic artery proper as it runs up along the common bile duct and supplies it with twigs in a non-axial distribution
• C. Vessels that run upward along the bile duct from the duodenal end of the duct such as the retroduodenal and the gastroduodenal arteries
• D. Vessels that arise from the cystic artery