The type of decay that has no charge associated with it is gamma decay (option C).
Gamma decay is a nuclear reaction with the emission of a gamma ray. A gamma ray is a high frequency/energy electromagnetic radiation emitted as a consequence of radioactivity.
Gamma rays are waves, not particles. This means that they have no mass and no charge.
This, therefore, suggests that when a gamma ray is emitted, no charge is involved.
Unlike alpha and beta decay that involves +2 and -1 charges respectively.
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