Which of the following methods is used for obtaining aluminium metal?

• Correct answer
  A

  Electrolysing fused $\mathrm{A}{\mathrm{l}}_2{\mathrm{O}}_3$ and cryolite
• B

  By heating $\mathrm{A}{\mathrm{l}}_2{\mathrm{O}}_3$ with carbon
• C

  By heating $\mathrm{A}{\mathrm{l}}_2{\mathrm{O}}_3$ in Muffle furnace
• D

  By a process called pyrometallurgy

Hence, the correct answer is option: 'A'.