Arrange the following oxides in the increasing order of their basic nature: $(a) Al_2O_3, (b) K_2O, (c) P_2O_5, (d) MgO$.
- A$d < b < c < a$
- B$b < c < a < d$
- C$c < a < d < b$
- D$a < c < d < b$
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