\[A{{l}_{2}}{{O}_{3}}\] is reduced by electrolysis at low potentials and high currents. If \[4.0\times {{10}^{4}}\] amperes of current is passed through molten \[A{{l}_{2}}{{O}_{3}}\] for 6 hours, what mass of aluminium is produced? (Assume 100% current efficiency. At. mass of\[Al=27g\text{ }mo{{l}^{-1}}\])

• A. \[8.1\times {{10}^{4}}g\]         
• B. \[2.4\times {{10}^{5}}g\]
• C. \[1.3\times {{10}^{4}}g\]         
• D. \[9.0\times {{10}^{3}}g\]