The correct answer is D.
The Commercial Revolution refers to the establishment, by Europeans powers, of an economic system based on trade, since the 11th century. During the 14th and 15th centuries European countries were keen on exploring new trade routes in order to compete with the other trading nations. This was part of the mercantilist approach, in which each country aimed to maximize exports and, ultimately, their reserves of gold and silver.
Imperalism and colonialism allowed the entrance of large quantities of precious metals in Europe, for those who had risked enough and who managed to became a new business and prosperous social class.