The answer is B. Equator.
Here's why:
A great circle is any circle drawn on the surface of a sphere that divides the sphere into two equal halves.
The equator perfectly fulfills this definition. It is an imaginary line circling the Earth exactly in the middle, dividing it into the Northern and Southern Hemispheres.
The Arctic Circle, Tropic of Cancer, Tropic of Capricorn are all lines of latitude. Lines of latitude are parallel to the equator and do not divide the Earth into equal halves. They are considered small circles.
If you think there is any confusion in given MCQS You can comment.
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Explanation
The answer is B. Equator.
Here’s why:
A great circle is any circle drawn on the surface of a sphere that divides the sphere into two equal halves.
The equator perfectly fulfills this definition. It is an imaginary line circling the Earth exactly in the middle, dividing it into the Northern and Southern Hemispheres.
The Arctic Circle, Tropic of Cancer, Tropic of Capricorn are all lines of latitude. Lines of latitude are parallel to the equator and do not divide the Earth into equal halves. They are considered small circles.
If you think there is any confusion in given MCQS You can comment.