Which Occurs During the Secretion of Hydrochloric Acid by Gastric

Which occurs during the secretion of hydrochloric acid by gastric epithelial cells?

A) There is a decrease in the pH of blood in the hepatic portal circulation.
B) Bicarbonate ions are secreted into the hepatic portal circulation.
C) Chloride ions are pumped from the cytosol of the gastric epithelial cells into the hepatic portal circulation blood.
D) Both H⁺ and K⁺ are actively pumped from the epithelial cell cytosol into the lumen of the stomach.
E) Vesicles containing H⁺/K⁺ -ATP-ase proteins are endocytosed into vesicles within the gastric epithelial cells.