orrect order of basic nature is :-A MgO < K2O < Al2O3 < Na2O B Na2O < K2O < MgO < Al2O3 C Al2O3 < MgO < Na2O < K2O D K2O < Na2O < Al2O3 < MgO

The correct order of basic nature for the given oxides is: Al2O3 < MgO < Na2O < K2O. Therefore, the correct option is C.

Here's the step by step explanation:

1. Al2O3 (Aluminium oxide) is amphoteric in nature. It can act as both acid and base. Therefore, it is the least basic among the given oxides.

2. MgO (Magnesium oxide) is a basic oxide, but less basic than the alkali metal oxides (Na2O and K2O).

3. Na2O (Sodium oxide) is more basic than MgO because Sodium is an alkali metal and the oxides of alkali metals are more basic.

4. K2O (Potassium oxide) is the most basic oxide among the given. This is because Potassium is an alkali metal and it is located under Sodium in the periodic table. As we move down the group, the basicity of oxides increases.