Final answer:
The correct answer to the student's question is: C) no known method.
Step-by-step explanation:
The radioactivity of a substance cannot be neutralized by any known method such as electrolysis, incineration, or burying it in salt mines. Radioactive decay is a natural process where unstable nuclei emit radiation to attain stability and is known as transmutation, where an element is converted to a different element.
To detect radioactivity, instruments like the Geiger counter or the scintillation counter are used. These devices cannot neutralize radioactivity but are crucial for measuring and tracking radioactive emissions