A neutron and a large nucleus. Hence, option C is correct.
What is nuclear fusion?
Nuclear fusion involves the fusion of 2 smaller nuclei into bigger nuclei.
Nuclear fission and nuclear fusion are nuclear reactions that produce energy in the form of heat.
Fission is the process of the division of heavy, unstable nuclei into two nuclei, and in fusion two nuclei combine, resulting in the release of energy.
Hence, a neutron and a large nucleus are the starting materials for nuclear fission.
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