Final answer:
The main function of the large intestine, or colon, is to reabsorb water from undigested food and process waste material. It also contains beneficial bacteria that aid in digestion. So, the correct answer is option c.
Step-by-step explanation:
The large intestine, also known as the colon, has the main function of reabsorbing water from undigested food and processing waste material. It is responsible for extracting water and mineral salts from the chyme, the residue of digested food, and storing waste material until it is eliminated through the anus. The large intestine also contains beneficial bacteria that aid in digestion and perform other important functions.
So, the correct answer is option c.