Of the following taxonomic categories which is the most inclusive (i.e. is the highest in hierarchy)? A. Order B. Subspecies C. Class D. Genus

The correct answer is: Class.

A class is a taxonomic rank that is used to classify organisms. It is the second highest rank in the Linnaean taxonomy, below phylum and above order. A class typically contains several orders, and each order contains several families.

The other options are:

• Order is a taxonomic rank that is used to classify organisms. It is the third highest rank in the Linnaean taxonomy, below class and above family. An order typically contains several families, and each family contains several genera.
• Subspecies is a taxonomic rank that is used to classify organisms that are closely related but not quite identical. A subspecies is typically defined by a small number of distinguishing characteristics, such as a difference in coloration or size.
• Genus is a taxonomic rank that is used to classify organisms that are closely related. A genus typically contains several species, and each species contains several individuals.

In conclusion, the most inclusive taxonomic category is class.