Concept: The digestive system of the human consists of an alimentary canal and associated digestive glands. The alimentary canal consists of the mouth, buccal cavity, pharynx, esophagus, stomach, small intestine, large intestine, rectum, and anus. The accessory digestive glands include the salivary gland, the liver, and the pancreas. Saliva contains a starch digestive enzyme called salivary amylase. The food is passed through the pharynx which is further carried down through the esophagus by peristalsis into the stomach. In the stomach mainly protein digestion takes place. Then the food enters the duodenum portion of the small intestine and is acted on by the pancreatic juice, bile, and finally by the enzymes in the succus entericus so that the digestion of carbohydrates, proteins, and fats is completed. The undigested food enters the caecum of the large intestine. The undigested waste materials are finally egested out through the anus. [ alt="F1 Prabhat Madhu 02.09.20 D8" src="//storage.googleapis.com/tb-img/production/20/09/F1_Prabhat_Madhu_02.09.20_D8.png" style=" width: 350px; height: 321px;"> Explanation: The small intestine is highly coiled measuring about 22 feet (7m) and the longest part of our digestive system whereas the large intestine measures about 6 feet, much shorter than the small intestine. The ingested food enters the duodenum portion of the small intestine and receives secretions from the liver and the pancreas. The liver is the largest gland of the body weighing about 1.2 to 1.5 kg in an adult and secretes bile juice. Pancreatic juice contains digestive enzymes that pass to the small intestine where they help to break down the carbohydrates, proteins, and lipids (fats) into simpler forms. Thus, from the above discussion, it is clear that statements B and C are correct.