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The correct answer is option 3, the Equator. The Equator is an imaginary line located at zero degree latitude which divides the Earth into the northern and southern hemispheres. It is the widest part of the Earth`s surface and is approximately 40,075 kilometers long. The Equator is an important reference point for geographic, climatic, and cultural purposes. It is also significant for navigation and helps in understanding the Earth`s rotation. The Tropic of Capricorn and Tropic of Cancer (options 1 and 2) are lines of latitude located at 23.5 degrees south and north respectively, and are responsible for marking the furthest points where the sun can be directly overhead at noon on specific days of the year. So, the correct answer is indeed option 3, the Equator.