Concept:A great circle is a circle formed on the surface of a sphere by a plane that passes through the sphere's centre.
Explanation:The correct description must focus on its geometric definition.
When a plane cuts through a globe at its centre, it creates the largest possible circle on the surface.
The equator and all lines of longitude are examples of great circles because their planes pass through the globe's centre.
The shortest distance between two points is a useful property of great circles, not the actual description of what they are.
Therefore, the best option is the one that defines the plane passing through the centre of the globe.
Answer:Option A: a circle whose plane passes through the centre of the globe.