Answer :
B) Secretin is the hormone that stimulates the duct cells to secrete bicarbonate-rich pancreatic juice.
When acidic chyme enters the duodenum, it triggers the release of two important hormones from the small intestine: secretin and cholecystokinin (CCK).
Secretin specifically stimulates the pancreas to produce an alkaline bicarbonate solution, which neutralizes the acidic environment in the duodenum. On the other hand, CCK stimulates the secretion of enzyme-rich pancreatic juice. Hence, option B is correct.