Concept:A great circle is the largest possible circle drawn on a sphere, and its arc gives the shortest distance between any two points on the Earth’s surface.
Explanation:When an aircraft or ship travels between two distant places, following a straight line on a flat map is not the shortest real route.
On the curved surface of the Earth, the shortest path lies along the arc of a great circle.
This path is known as a great circle route.
Using this route reduces the total distance that must be travelled.
Because less distance is covered, less time is spent in the air or at sea.
A shorter travel time also means lower fuel consumption.
Thus, the main purpose of using a great circle route is to save both time and fuel.
It is not used to avoid deserts, the North Pole, or long-distance barriers.
Answer:B. save time and fuel