Under the system of mercantilism, the American colonies served all of the following primary roles EXCEPT as a source of labor for major European industries. Thus the correct answer is B.
What is mercantilism?
Governments employed their industries to ’s biggest power at the expense of other nations during the period of mercantilism.
Its objective is to balance an economy's imported and exported goods to the highest degree possible. In order to accomplish the goal, it encourages colonialism, tariffs, as well as traded goods subsidies.
The American colonies provided as a raw material supply for European countries under the international trading regime. It also provides income and tax revenue for European firms.
Therefore, option B as a source of labor for major European industries is appropriate.
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