Correct Answer - b
the hierarchy includes seven obligate categories kingdom division or physlum class, family,genus, species more precise, In order to make taxonomic position of species more preocise, categories have been added to this list. They are called intermediate categories, e,g. Subkingdom, superphylum, or superdivison, superclass, subcalss, superorder, suborder, superfaimly.subfamily, tribe, subspecies, variety etc.