Answer: Option D
Answer: (d)
A great circle, also known as an orthodrome or Riemannian circle, of a sphere, is the intersection of the sphere and a plane that passes through the centre point of the sphere, as opposed to a general circle of a sphere where the plane is not required to pass through the centre.
The equator is the circle that is equidistant from the North Pole and the South Pole. It divides the Earth into the Northern Hemisphere and the Southern Hemisphere. Of the parallels or circles of latitude, it is the longest, and the only ‘great circle’ (in that it is a circle on the surface of the earth, centred on the centre of the earth). All the other parallels are smaller and centred only on the earth’s axis.