The scientific term for chewing food is mastication.
Option C
Explanation:
The food splits into smaller pieces during mastication. As the food is broken down its surface area increases as the size decreases due to which many other enzymes can also act on the masticated food.
Mixing of enzymes occur both during mastication and after mastication. The food is passed down through oesophagus into the stomach where other enzymes and acids are mixed to breakdown the food into further smaller molecules.