which of the following authorities would be best to use in a persuasive essay on the topic of ways to treat…

Brief Explanations:

An oncologist is a medical - professional specializing in cancer treatment. Their expertise in medical procedures, therapies, and research makes them the most authoritative source for a persuasive essay on cancer treatment methods compared to the other options. A cancer survivor has personal experience but not professional medical knowledge, a family member of a survivor has even less direct medical expertise, and a cancer awareness activist may have general knowledge but not the in - depth medical knowledge of an oncologist.

Answer:

C. an oncologist that treats cancer