Which of the following is the only taxonomic category that has a real existence?

Which of the following characters given below displays the description of the lowest taxonomic category of organisms in the plant and animal kingdom?

Match the following taxonomic categories with their characteristics:

Category	Characteristic
$A$. Species	$i$. Related families
$B$. Genus	$ii$. Related genera
$C$. Order	$iii$. Organisms capable of interbreeding to produce fertile offspring
$D$. Family	$iv$. Group of species with a common ancestor

Assertion : Taxon and category are different things.
Reason : Category shows hierarchical classification.

The common taxonomic categories are given below. Arrange them in the correct sequence starting from the smallest unit:
$(i)$ Genus $(ii)$ Family $(iii)$ Species $(iv)$ Order $(v)$ Subspecies

Cat is included in which family?