Which of the following represents the correct ascending order of taxonomic categories based on the number of organisms?

Which of the following is the highest taxonomic category?

$A :$ Two plants $A$ and $B$ are treated as two taxonomic species.
$R :$ Both $A$ and $B$ are different in correlated characters.

The suffix $-inae$ denotes which taxonomic category?

In the given taxonomic sequence,what could $A, B$,and $C$ be?

Select the correct statements $(i-iv)$ regarding taxonomic categories.
$(i)$ Each step or rank in hierarchy is called taxonomic category.
$(ii)$ Species is a group of individual organisms with fundamental similarities capable of breeding among themselves.
$(iii)$ Taxonomic studies of all unknown organisms have led to the development of common categories like kingdom,phylum or division,class,order,family,genus and species.
$(iv)$ Lower the category,greater is the difficulty of determining the relationship to other taxa at the same level.