Answer:
Option: They improved their own capital city by importing skilled workers from conquered regions.
Step-by-step explanation:
Mongols were known as Nomadic horse people from the eastern steppe lands of Asia that created the largest empire under Genghis Khan, who united the clans of the steppe under his leadership. With the help of the imported skilled workers from the conquered regions, Mongols built the capital city in the Karakorum in 1236, after defeating the Jin empire in 1235, walls were constructed around the place and build a palace, which was before a yurt town.