The Presence of Food in the Stomach Triggers the Release

The presence of food in the stomach triggers the release of a hormone that stimulates contraction of the pyloric sphincter. Specifically, these events involve release of

A) secretin in the cephalic phase of digestion.
B) gastrin in the gastric phase of digestion.
C) CCK in the intestinal phase of digestion.
D) lipase in the intestinal phase of digestion.
E) chyle in the secretory phase of digestion