Answer:
Among the option you provided,the gastrointestinal hormone is A. CKK(cholecystokinin)
Step-by-step explanation:
Cholecystokinin(CKK) is a gastrointestinal hormones that is produced by cells in small intestine.It plays an important in the process of digestion as it stimulates the release of digestive enzymes from pancreas and promotes the contraction of the gallbladder to release bile.