Answer: A (ions are reduced). The negative electrode is the cathode. Cations (here \(\text{K}^{+}\)) move to it and gain electrons: \(\text{K}^{+} + \text{e}^{-} \rightarrow \text{K}\).
Gain of electrons is reduction, so the ions are reduced. B is wrong: potassium atoms form, not molecules. C is wrong: the charge decreases from \(+1\) to 0, it does not increase. D is wrong: electrons are gained, not released. Answer A.
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