Final answer:
The glossopharyngeal nerve is responsible for swallowing, taste, and secreting saliva.
Step-by-step explanation:
The glossopharyngeal nerve, also known as the ninth cranial nerve, is responsible for swallowing, taste, and secreting saliva. It plays a role in the contraction of muscles in the tongue and throat, as well as part of the sense of taste. Additionally, it causes saliva production. Therefore, option C, swallowing, taste, and secreting saliva, is the correct answer.