Aluminum Metal Is Refined in a Very Energy-Intensive Process from Bauxite

Aluminum metal is refined in a very energy-intensive process from bauxite ore using the Hall process,which requires electrolysis of aluminum oxide,Al₂O₃,in molten cryolyte at more than 1012°C.In an industrial electrolysis cell,1900 kg of aluminum oxide was reduced with a current of 1500 amps.How long did it take to reduce all the reactant to aluminum metal?

A) 1.0 $\times$ 10³ hr
B) 2.0 $\times$ 10³ hr
C) 330 hr
D) 4.0 $\times$ 10³ hr
E) 660 hr