The correct option is C A, B, C and D
The ulcers formed in the stomach are called peptic ulcers. These are the open sores formed due to excess secretion of HCl, pepsin and gastric juices leading to the disintegration of mucosal lining layer of the stomach. This results in decreased mucus secretion which affects digestion of food. The bacterium Helicobacter pylori, alcohol consumption, and cigarette smoking are some of the factors responsible for peptic ulcers. Thus the correct answer is option C.