Blister copper is refined by stirring molten impure metal with green logs of wood because such a wood liberates hydrocarbon gases (like $CH_4$). This process $X$ is called . . . . . . and the metal contains impurities of $Y$ is . . . . . . .
- A$X = \text{cupellation}, Y = CuO_2$
- B$X = \text{poling}, Y = Cu_2O$
- C$X = \text{poling}, Y = CuO$
- D$X = \text{cupellation}, Y = CuO$
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