The cities of regions that became tributary states of the Mongols' empire were Annam and Baghdad. Hence, options A and B hold true.
What is the significance of the Mongols?
Mongols were termed as the people who belonged to the Mongol Empire. The Mongol Empire was set up and founded by Genghis Khan, and was later succeeded by Kublai Khan.
During the rule of these Mongol emperors, the empire set up the base or important centers of administration of the empire in the cities like Annam and Baghdad (Afghanistan). These two cities handled the biggest empire ever in the world during such time.
Hence, options A and B hold true regarding the Mongols.
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