The correct option is C Alimentary canal
The alimentary canal is a tube which includes mouth, oesophagus, stomach, small intestine, large intestine, and anus. Food once chewed in the mouth passes down to the pharynx after swallowing. From the pharynx, it passes through the food pipe or oesophagus to the stomach then small intestine where maximum absorption of food takes place and then move to large where waste material excrete out from the anus. Hence the answer is Option C.