The correct option is B pancreas
Secretin is secreted by the epithelium of the duodenum. In the pancreas, it stimulates the release of bicarbonates into the pancreatic juice. In the liver, it stimulates the secretion of bile. In the stomach, it inhibits gastric secretion and motility.
Crypts of Lieberkuhn are simple tubular structures which occur throughout the small intestine between the villi.