Answer:
B. gastric phase of gastric secretion
Explanation:
The gastric phase of gastric secretion is stimulated by distension of the stomach. This distension is caused by the presence of food in the stomach and a decrease in stomach pH. Stomach distention causes the release of acetylcholine which is the first step in releasing stomach juice. After the release of gastric juice, some proteins present in the stomach react with hydrogen ions, the result of this is the increase in pH in this organ. At this point, gastric juice stops being secreted and gastrin is released which stimulates the secretion of gastric acid.
