The correct answer is c) obtain raw materials from colonies.
<em>The motivation behind the new imperialism was to use colonies as factory workers.
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The monarchy of England saw the colonies as an opportunity to get money and resources for Great Britain. The new imperialism tried to exploit the colonies raw materials that England needed for its colonial expansion. Nations under the control of powerful European nations had to give its raw materials and natural resources to the monarchies.
The other options of the question were, a) reduce overpopulation, b) built factories in colonies, and d) use colonies as factory workers.
