The correct option is B Caecum
Caecum is a pouch-like structure which is a part of the digestive system present at the junction of small and large intestine. In rabbits, the cecum is enlarged and contains bacteria that aid in the digestion of plant matter and facilitate nutrient absorption. Anus is the opening where the gastrointestinal tract ends and exits the body. Duodenum is the first part of the small intestine and is located between the stomach and the middle part of the small intestine called jejunum.