Answer
c.
Work Step by Step
Option a. is incorrect. Digestion does not take place in the esophagus.
Option b. is incorrect. In the large intestine, undigested materials are deposited and eventually eliminated at feces.
Option d. is incorrect. The small intestine is the site where absorption of nutrients mainly takes place.
Option c. is correct. The mouth is where mechanical digestion starts. This process breaks bigger food molecules into smaller ones.
