Which one of the following orders present the correct sequence of the increasing basic nature of the given oxides ?

• A

  ${\mathrm{Al}}_2{\mathrm{O}}_3<\mathrm{MgO}<{\mathrm{Na}}_2\mathrm{O}<{\mathrm{K}}_2\mathrm{O}$

• B

  $\mathrm{MgO}<{\mathrm{K}}_2\mathrm{O}<{\mathrm{Al}}_2{\mathrm{O}}_3<{\mathrm{Na}}_2\mathrm{O}$

• C

  ${\mathrm{Na}}_2\mathrm{O}<{\mathrm{K}}_2\mathrm{O}<\mathrm{MgO}<{\mathrm{Al}}_2{\mathrm{O}}_3$

• D

  ${\mathrm{K}}_2\mathrm{O}<{\mathrm{Na}}_2\mathrm{O}<{\mathrm{Al}}_2{\mathrm{O}}_3<\mathrm{MgO}$