Answer:
Option (D).
Explanation:
Digestion may be defined as the process of breakdown of larger food particles into smaller particles with the help of enzymes and digestive juices. The production of digestion must be absorbed in the body.
Stomach is the organ that initiates the protein digestion. The chemical environment of stomach activates the inactive form enzymes into active state. Some proteins are also denatured in the stomach.
Thus, the correct answer is option (D).
