Electrolytic reduction cell used for conversion of calcined Al 2 O 3 to Al is a carbon lined furnace operating at 800-900 °C. The purpose of electric current supplied to the furnace is to

• A. achieve very high purity of aluminium (99.9%).
• B. keep the electrolyte in liquid condition by the generation of heat.
• C. electrolytically dissociate alumina.
• D. both(b) & (c).