The pH of the stomach is low enough and the protease activity high enough that the cells of the stomach itself are at risk of self-digestion. This is prevented by which of the following?
A) a sufficient colony of H. pylori
B) mucus secretion and active mitosis of epithelial cells
C) high level of secretion by chief cells
D) high level of secretion from parietal cells
E) secretions entering the stomach from the pancreas