The correct option is (a) "species".The correct heirachy of classification of various taxon in descending order is : Kingdom , phylum, class ,order ,genus, species . The kingdom is the highest taxon with least similar characters shared between its various members while species is the lowest level with almost similar morphological and behavioural similarities. Species is followed by genus with slightly fewer similarities among its members, SO THE CORRECT OPTION IS species.

Introduction:
In taxonomy, the classification of organisms is based on a hierarchical system. The system starts with the most general category, called the kingdom, and proceeds to more specific categories. Genus is one of the categories in this hierarchical classification.

Main Body:
Definition of Genus:
A genus is a rank in the classification of organisms, below the family and above the species. It represents a group of closely related species that share common characteristics. For example, the genus Panthera includes species such as lions, tigers, and leopards.

Less general than genus:
Among the given options, the least general in character as compared to genus is the species.

Explanation:
Species:
Species is the most specific category in the classification hierarchy. It is a group of individuals that can interbreed to produce fertile offspring. Members of the same species share common characteristics and are distinct from individuals of other species. For example, Homo sapiens is the species name for modern humans.

Division:
Division is a taxonomic rank that is used primarily in the classification of plants. It is equivalent to the phylum rank used for animals. Divisions are higher in rank than classes and contain a group of related classes. For example, the division Magnoliophyta includes classes such as Magnoliopsida and Liliopsida.

Class:
Class is a taxonomic rank that is used for grouping organisms with similar characteristics. It is higher in rank than orders and contains a group of related orders. For example, the class Mammalia includes orders such as Carnivora and Primates.

Family:
Family is a taxonomic rank that is higher in rank than genus. It represents a group of related genera. For example, the family Felidae includes the genera Panthera and Felis.

Conclusion:
In conclusion, among the given options, the species is less general in character as compared to the genus. The species represents the most specific category in the classification hierarchy, while the other options (division, class, and family) are higher in rank and represent broader categories.