Question

how do fission nuclear reactions differ from fusion nuclear reactions?
fission reactions involve the conversion of matter into energy, but fusion reactions do not.
fusion reactions involve the conversion of matter into energy, but fission reactions do not.
fission reactions are used to generate electricity for consumers, but fusion reactions are not.
fusion reactions are used to generate electricity for consumers, but fission reactions are not.

Explanation:

Both fission and fusion reactions convert matter into energy according to Einstein's $E = mc^{2}$. Currently, fission reactions are used in nuclear power - plants to generate electricity for consumers, while fusion is not yet practical for large - scale electricity generation due to technological challenges.

Answer:

C. Fission reactions are used to generate electricity for consumers, but fusion reactions are not.