What helped the Khans maintain communication over long distances during the height of the Mongol Empire? A The Khans built an extensive network of roads throughout the territories that they conquered.
B
The Khans forced people to learn Mongolian so that they could speak to people from other regions.
С
The Khans required their subjects to learn to read and write so they could understand the empire's laws.
D
The Khans developed a postal system that allowed them to efficiently send messages throughout the empire.