When did international economic relations as we know them now originate? Select one – the most appropriate answer.单项选择题

In the age of Industrial Revolution in the 18th century when British companies began investing abroad.

In the late 20th century with the introduction of contemporary telecommunication networks and other technological achievements.

In the second part of the 20th century when the Second World War ended, and different countries became free to set up trade and investment linkages between each other.

In the Age of Discovery in the 15th century when different continents were united by sea routes and began trading between each other.