Answer: Order.
- A Genus
- B Order
- C Species
- D Class
Correct answer: B. Order
Explanation: In taxonomic hierarchy, related families are grouped into an Order, which is itself grouped with other related orders into a Class.
The taxonomic hierarchy narrows from Kingdom (broadest, covering the most organisms but fewest shared traits) down to Species (narrowest, fewest organisms but most shared traits) - every level in between is a progressively more specific subset of the one above it.
Concept context
Biodiversity, taxonomy, binomial nomenclature, the taxonomic hierarchy, and taxonomic aids like herbaria and botanical gardens. The foundational first chapter of NCERT Biology.