The correct option is D taxon
Each rank in the taxonomic hierarchy is called a taxon. Species, genus and order are a taxon. A group of organisms that are capable of interbreeding and producing a fertile offspring are known as species. For example sapiens is a species. Several species with similar characteristics form the genus. For example we human beings belong to the genus Homo and also other species like the Homo habilis also belong the same genus. Order is a taxa that comprises several families with similar characteristics.