New nuclei and neutrons result from:

a. nuclear fusion

b. the release of electrons from a positively charged atom

c. the splitting of an atom s nucleus

d. the splitting of an atom s neutron

I think the correct answer from the choices listed above is option C. New nuclei and neutrons result from the splitting of an atom's nucleus. It is called nuclear fission where atoms are being split into smaller parts. Hope this answers the question. Have a nice day.