Concept:Latitude 66.5∘ marks a special polar circle on the Earth.Explanation:The Equator is at 0∘ latitude.The Arctic Circle is located at 66.5∘ North.The Antarctic Circle is located at 66.5∘ South.When the question states only “latitude 66.5∘”, it refers to the Arctic Circle at 66.5∘N.Thus, among the options, it is the arctic circle.Answer:B. arctic circle