Correct Answer: (B) Proteins will not be adequately hydrolyzed by pepsin to proteases and peptones.Explanation:Parietal or oxyntic cells are the cells present in the gastric glands.Parietal cells secrete hydrochloric acid (HCl) and an intrinsic factor.This HCl converts pepsinogen and prorenin into active enzymes pepsin and rennin.These enzymes only operate in an acidic medium provided by HCl.Pepsin hydrolyses proteins into peptones and larger peptides and rennin is a proteolytic enzyme found only in infants.If parietal cells become partially non-functional then the formation of active proteolytic enzymes, pepsin does not take place, and protein will not be hydrolyzed.Hence, the correct answer is Proteins will not be adequately hydrolyzed by pepsin to proteases and peptones.