The correct answer is A) the Inca built a vast network of roads.
The accomplishment that most likely helped the Incan emperor to maintain rule over widespread lands was that the Inca built a vast network of roads.
The Inca were great engineers. They built a vast network of roads called the Royal Highway that helped the empire to transport goods to other territories and the Army to maintain control over widespread of land. The roads crossed many kinds of lands such as mountains, plains or deserts and connected towns through bridges or stairs in difficult places to access. The Inca roads also symbolized the power and control of the Emperor over its vast territory.
