Final answer:
Option C: I should use an alcohol-based mouth rinse to kill bacteria.
Step-by-step explanation:
The statement that indicates that the client needs more teaching about mucositis is option C: I should use an alcohol-based mouth rinse to kill bacteria. Mucositis is the inflammation and ulceration of the mucous membranes in the mouth, commonly caused by chemotherapy or radiation therapy. Using an alcohol-based mouth rinse can further irritate the already sensitive tissues and worsen the condition. It is recommended to use a gentle, non-alcohol based rinse or plain water to minimize trauma and promote healing.