best represents the change occurring at the cathode is \text { A. } X^{+}(1)+e^{-} \rightarrow X(s) \text { B. } X^{2+}(1)+2 e^{-} \rightarrow X(s) \text { C. } X^{3+}(1)+3 e^{-} \rightarrow X(s) \text { D. } X^{4+}(l)+4 e^{-} \rightarrow X(s)
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