The correct option is C feeding habit
The nature of digestive tract in different vertebrates vary based on their eating habits or the type of food they eat. For e.g., cows have ruminant stomach which inhabits methanogen bacteria. This helps them digest cellulose present in leaves of the plants. Similar to rumen in cows, rabbits have cecum, that inhabits bacteria to digest cellulose.
Human beings cannot digest cellulose as they don't have ruminant stomach.