Which of the following show diagonal relationship?

Consider the following halides: $(1) \; BCl_3$,$(2) \; AlCl_3$,$(3) \; GaCl_3$,$(4) \; InCl_3$. What is the decreasing order of their Lewis acid strength?

Assertion $(A)$: $[B(OH_2)_6]^{3+}$ and $[B(OH)_4]^{-}$ form octahedral and tetrahedral structures.
Reason $(R)$: Being electron deficient, boron readily reacts with Lewis bases like $H_2O$ and $OH^{-}$.
The correct option among the following is

The correct order of Lewis acidity for $BX_3$ is:

What is the correct order of melting points for the elements of Group $13$?

Relative stability orders of $+1$ and $+3$ oxidation states of $Ga, In, Tl$ are respectively: