What helped the Khans maintain communication over long distances during the height of the Mongol Empire? A The Khas 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
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
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