Which of the following is considered a unit of classification?

The naming and classification of living organisms are based on what?

Assertion $(A)$: $A$ taxonomic category composed of a group of related genera is called a family.
Reason $(R)$: The family $Blattidae$ includes various species of pigeons and doves.

The correct sequence of the various taxons while naming an organism is:

Identify the odd one out from the following.

Can you identify the correct sequence of taxonomical categories?
$(a)$ Species $\rightarrow$ Order $\rightarrow$ Phylum $\rightarrow$ Kingdom
$(b)$ Genus $\rightarrow$ Species $\rightarrow$ Order $\rightarrow$ Kingdom
$(c)$ Species $\rightarrow$ Genus $\rightarrow$ Order $\rightarrow$ Phylum