$5.06 \ g$ of pure cupric oxide $(CuO)$ on complete reduction gives $4.04 \ g$ of metallic copper. In another experiment,$1.3 \ g$ of metallic copper is dissolved in nitric acid and the resulting solution is carefully dried to yield $1.63 \ g$ of $CuO$. Which law of chemical combination is illustrated by these results?
- ALaw of Equivalent Proportions
- BLaw of Definite Proportions
- CLaw of Multiple Proportions
- DLaw of Conservation of Mass
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