Answer: D. tribes formed around kinship and common ancestors.
Step-by-step explanation:
The Mongols are an ethnic group originating from the places where Mongolia, Russia, and China are currently.
Formerly, the ethnic group was spread in several small tribes over thousands of kilometers. These tribes were composed of family nuclei with relatives in common.
The tribes were unified in a nation under the command of Genghis Khan; however, there were always few people.
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