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I believe the answer is C

Reactions that affect the nucleus of an atom are called Nuclear Reactions.

What are nuclear Reactions ?

The reactions that involve bombarding it with an energetic particle of an atomic nucleus which causes  change in the identity or characteristics .  The bombarding particle may be an alpha particle, a gamma-ray photon, a neutron, a proton, or a heavy ion.

Nuclear decay reactions and nuclear transmutation reactions are the two types of nuclear reactions.

An unstable nucleus releases radiation and is changed into the nucleus of one or more additional elements in a nuclear decay reaction, also known as radioactive decay.

The daughter nuclei that result have a lower mass and lower energy (making them more stable) than the parent nucleus that destroyed.

In a nuclear transmutation reaction, on the other hand, a nucleus combines with a subatomic particle or another nucleus to produce a more massive product nucleus than the original material.

To know more about Nuclear Reactions

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