Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides?
A. `Al_(2)O_(3) lt MgO lt Na_(2)O ltK_(2)O`
B. `MgOlt K_(2)O lt Al_(2)O_(3) lt Na_(2)O`
C. `Na_(2)O lt K_(2)O lt MgO lt Al_(2)O_(3)`
D. `K_(2)O lt Na_(2)O lt Al_(2)O_(3) lt MgO`
