Concept:The earliest known inhabitants of Antarctica are identified from the passage's description of prehistoric life.Explanation:Read the last line of the passage: "During the time of the dinosaurs, Antarctica was more temperate and hosed dinosaurs and many other life-forms. Now there is very little indigenous life." This clearly states that dinosaurs lived there in the past. The passage mentions no human residents, only seasonal visitors. It also says Antarctica has always been mostly icy, but during the dinosaur era it was temperate. Therefore, dinosaurs are the earliest known inhabitants mentioned.Answer:Option C: Dinosaurs