Why has the author selected London and Australia as examples in the passage?
A. Most of the world has traveled to London and Australia.
B. It has always been easy to travel between London and Australia.
C. London and Australia are both part of the British commonwealth.
D. London and Australia are very far from each other.
E. There are 2 daily flights between London and Australia.
The author has selected London and Australia as they are very far from each other and anyone who has seen a globe can recognize that without commercial air travel such a trip would be difficult and timely.