Kingdom, Phylum, Class, Order, Family, Genus, Species

The correct answer is option 'A' (Class) because it includes all the other lower taxa such as order, family, genus, and species.

Explanation:

Taxonomy is the science of classification of living organisms. Taxonomic classification is hierarchical and starts with the broadest category and moves down to the smallest. The seven main categories of classification are- Kingdom, Phylum, Class, Order, Family, Genus, and Species. Each of these categories is called a taxon (plural: taxa).

The correct order of the taxonomic hierarchy is Kingdom, Phylum, Class, Order, Family, Genus, Species.

- Kingdom: It is the broadest and most inclusive taxonomic category. All living organisms are classified into five kingdoms: Monera, Protista, Fungi, Plantae, and Animalia.
- Phylum: It is the second level of classification. Each kingdom is divided into several phyla based on the similarities and differences in their body plans and structural characteristics.
- Class: It is the third level of classification. Each phylum is further divided into several classes based on shared characteristics.
- Order: It is the fourth level of classification. Each class is divided into several orders based on shared characteristics.
- Family: It is the fifth level of classification. Each order is divided into several families based on shared characteristics.
- Genus: It is the sixth level of classification. Each family is divided into several genera based on shared characteristics.
- Species: It is the smallest and most specific taxonomic category. Each genus is divided into several species based on shared characteristics.

In conclusion, the correct answer is 'Class' because it includes all the other lower taxa such as order, family, genus, and species.