Answer
a.
Work Step by Step
Options b. and c. are incorrect. Phyla are the next inclusive taxa after kingdoms. Orders lie toward the middle of the taxonomic ranking.
Option d. is incorrect. Domains did not come about until much later than Linnaeus's time.
Option a. is correct. According to the classification system devised by Linnaeus, kingdoms is the largest and, therefore, most inclusive of all the taxa.
