Final answer:
The quotation reflects an economic motivation for imperialism, where European powers sought economic gain through the exploitation of colonized regions and the demonstration of their global dominance.
Step-by-step explanation:
The motivation for imperialism reflected in the quotation is best classified as economic gain. In the 19th century, imperialism was driven by multiple motives amongst which the pursuit of economic benefits was primary. Nations sought to expand their empires to gain access to raw materials, new markets for their industrialized goods, and opportunities for capital investment. The quotation suggests that although the pretense of imperialism was often to bring civilization or benevolence, the actual practices frequently involved exploitation and profit-seeking at the expense of the colonized regions. Additionally, while private merchant ventures often failed to turn a significant profit, the competition for colonial possessions was also a way for European powers to demonstrate their political and military might on the global stage.