The correct option is B Cholecystokinin-Pancreozymin
Pancreatic exocrine secretions are high in bicarbonate. CCK stimulates pancreatic secretion through hormonal and neuronal pathways. CCK is released from I cells of the small intestine and diffuses into the blood stream where it is carried to the pancreas. CCK binds to receptors on acinar cells to stimulate pancreatic enzyme secretion.
So, the correct option is option B.