Which of the following compounds is the least ionic?

Assertion $(A)$: $LiCl$ and $MgCl_2$ are soluble in ethanol.
Reason $(R)$: Lithium and magnesium are harder than their respective group elements.

The correct order of increasing ionic character is:

Amongst $LiCl$,$BeCl_2$,$MgCl_2$,and $RbCl$,the compounds with the greatest and least ionic character,respectively,are:

The order of covalent character of $KF, KCl, KI$ is

Given below are two statements: One is labelled as Assertion $A$ and the other is labelled as Reason $R.$
Assertion $A :$ Lithium halides are somewhat covalent in nature.
Reason $R :$ Lithium possesses high polarization capability.
In the light of the above statements,choose the most appropriate answer from the options given below: