The correct option is D 4
The ruminant stomach is composed of 4 separate chambers. Food passes first into the rumen, then reticulum, omasum and finally into the abomasum before entering the duodenum. The first three compartments are adapted to digest complex carbohydrates with the aid of microorganisms which produce volatile fatty acids - the major energy source of ruminants. The last compartment, the abomasum resembles the simple monogastric stomach in structure and function.