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Option 1, 23.5° South - Tropic of Cancer, is incorrect. The Tropic of Cancer is located at about 23.5° North, not South.
Option 2, 23.5° South - Tropic of Capricorn, is the correct answer. The Tropic of Capricorn is located at approximately 23.5° South. This imaginary line marks the southernmost point where the Sun is directly overhead at noon on the December solstice.
Option 3, 23.5° North - Tropic of Capricorn, is incorrect. The Tropic of Capricorn is located in the Southern Hemisphere, around 23.5° South, not North.
Option 4, 66° North - Antarctic Circle, is incorrect. The Antarctic Circle is located at 66.5° South, not North. It marks the northernmost point where the Sun can still be seen above the horizon on the June solstice.
Therefore, the correct pair is Option 2, 23.5° South - Tropic of Capricorn.