The correct answer is D.
During the industrial revolution era that took place mostly during the 19th century, most developed countries industrialized. One of the pillars on which such process was based, were the cheap raw materials that were extracted in the colonies and brought to the mother country, where they were used in production processes to manufacture products and services cheaply. Afterwards, those products were sold in the home country and all over the world (including on the same colonies where the inputs had come from).
Current developing countries were colonies of current developed nations during the industrialization era.
