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In the metallurgy of aluminium, when the fused matrix is electrolysed, the overall reduction reaction is

ChemistryGeneral Principles and Processes of Isolation of MetalsCOMEDKCOMEDK 2015

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A $\mathrm{Al}_{2} \mathrm{O}_{3}+3 \mathrm{C} \longrightarrow 2 \mathrm{Al}+3 \mathrm{CO}$
B $\mathrm{Al}_{2} \mathrm{O}_{3} \longrightarrow 2 \mathrm{Al}^{3+}+3 \mathrm{O}_{2}$
C $2 \mathrm{Al}_{2} \mathrm{O}_{3}+3 \mathrm{C} \longrightarrow 4 \mathrm{Al}+3 \mathrm{CO}_{2}$
D $\mathrm{Al}_{2} \mathrm{O}_{3}+2 \mathrm{CO} \longrightarrow 2 \mathrm{Al}+2 \mathrm{CO}_{2}$