The most accurate identification of the role of the Italian city-states in the European Commercial Revolution is:
Italian city-states fueled the European Commercial Revolution by participating in trade and developing new banking practices.
During the Commercial Revolution, particularly from the 11th to the 16th centuries, Italian city-states such as Venice, Genoa, and Florence became central hubs of commerce and finance in Europe. They played a crucial role in establishing trade routes, facilitating maritime trade, and developing advanced financial practices, including banking systems, letters of credit, and joint stock companies. These innovations helped to increase trade volume and economic activity across Europe, laying the groundwork for modern capitalism.