C. <u>A circle of circumference whose centre coincides with the centre of earth</u>.
Explanation:
Geodetics is the science that tells about the center of spherical circles whose center coincides with that of a complete sphere.
The great circle also known as the Orthodrome is a sphere whose center passes through the central points of a sphere thus all great circles have the same center and circumference as each other.
In pair of antipodal points which is infinitely form many great circles. The prime meridian 0 degree is an example of this greater circle. They are common for navigation and aviation.
Having an equatorial radius of 6378.137 km of dividing the earth into two equal parts of north and south zones.
