Concept:The Linnaean system ranks organisms into nested groups, from broadest to most specific.
Explanation:In the Linnaean hierarchy, the correct order from most inclusive to least inclusive is: Kingdom, Phylum, Class, Order, Family, Genus, Species.
Kingdom is the highest and broadest rank among the options given.
Domain is not part of the original Linnaean system, though it is broader than kingdom in modern classification.
Since the question asks specifically about the Linnaean system, Kingdom is the most inclusive level listed.
Answer:A. Kingdom