Which of the following oxides is most basic?

Arrange the following acids in the decreasing order of their acidic strength: $ClOH \,(I), BrOH \,(II), IOH \,(III)$. Select the correct option.

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R.$
Assertion $A :$ Metallic character decreases and non-metallic character increases on moving from left to right in a period.
Reason $R :$ It is due to increase in ionisation enthalpy and decrease in electron gain enthalpy,when one moves from left to right in a period.
In the light of the above statements,choose the most appropriate answer from the options given below :

The correct order of the metallic character of the elements $Be, Al, Na, K$ is

The most electropositive element possesses the electronic configuration

In the periodic table,metallic character of the elements shows which one of the following trends?