The human stomach's gastric glands produce key digestive components:
- Hydrochloric acid (HCl) aids food breakdown and establishes an acidic milieu for pepsin's function.
- Pepsin is an enzyme that degrades proteins into smaller peptides.
- Mucus shields the stomach lining from acid and prevents ulcers.
Therefore, the proper selection is (B) Hydrochloric acid, Pepsin, Mucus.