"<span>C. Colonies of imperial nations, such as Congo and India" would be the best option, since most of Europe's colonies during this time were heavily exploited in terms of people and resources. </span>
Colonies of imperial nations, such as Congo and India,benefited least from 19th-century imperialism.
Explanation.
Imperialism is a situation where the strongest and powerful nations interns of power, economy and also politically stable , dominates other countries politically ,socially and also economically.
Rapid expansion of colonial empires in the late 19th century .Nationalism helped in promoting it as political leaders expanded their support for the states showing off about their achievements in colonial war .
