The correct option is B Small intestine
Plicae circularis lines the walls of small intestine. It is also called the ‘valve of Kerckring’. It increases the absorptive area of the small intestine. It is more prominent in the jejunum of small intestine.
The broadest part of the alimentary canal is the stomach. Food enters here in the form of bolus. It is located in the left upper part of the abdomen. It is a J- shaped bag and is also known as the ‘gaster’.
Oesophagus is a 25 cm long and approximately 3 cm wide muscular tube. It is also known as gullet, food pipe or food tube. It helps in the transfer of food from pharynx to the stomach by peristalsis.