A process in which a large nucleus splits into two or more parts is called nuclear fission. That is option B
A nuclear fission is the process by which the unstable nucleus of heavy atoms splits into two or more smaller nuclei which are usually called the fission products.
Example of elements that can undergo nuclear fission reaction include the following:
Nuclear fusion is the combination of two or more lighter nuclei to form a single heavy nucleus with the release of energy. This is the direct opposite of a nuclear fission reaction.
Therefore, a process in which a large nucleus splits into two or more parts is called nuclear fission.
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