The order of stability of metal oxides is:

• A
  $Fe_{2}O_{3} < Cr_{2}O_{3} < Al_{2}O_{3} < MgO$
• B
  $Cr_{2}O_{3} < MgO < Al_{2}O_{3} < Fe_{2}O_{3}$
• C
  $MgO < Al_{2}O_{3} < Cr_{2}O_{3} < Fe_{2}O_{3}$
• D
  $Fe_{2}O_{3} < Al_{2}O_{3} < Cr_{2}O_{3} < MgO$