Secretions from two types of cells in the stomach, are required for the digestion of proteins. Match the descriptions of potential problems in digestion with the defects in one or both cell types that might cause the problems. Both parietal cells and chief cells function normally Functional chief cells, but non-functional parietal cells functional parietal cells, but non-functional chief cells non-functional parietal cells and non-functional chief cells A. proteins denatured, but no chemical digestion of proteins B. pepsinogen not activated, proteins not denatured, no chemical digestion of proteins C. normal chemical digestion of proteins in the stomach D. no denaturation or chemical digestion of proteins