The Age of Imperialism was an age when Western powers colonized and divided Africa and large areas of Asia. The reasons for imperialism include economic competition between European countries or powers. Social Darwinism and racial superiority was another reason for imperialism. This is a phenomenon where the fittest one is considered superior or the fittest one enjoys survival. Another cause was white man's burden, which is an idea where white colonizers believed that they had a burden to colonize blacks.
The idea which is not considered a cause of imperialism was the technological superiority of non-Europeans. Therefore, option D is correct.
