Answer :
A. Xuanzong
Of all the leaders listed, Xuanzong is the only one who ruled in the Tang Dynast, therefore he is the correct answer. Genghis Khan was the leader of the Mongol Empire, Yangdi was of the Sui dynasty and Huizong ruled during the Song dynasty. Therefore, neither B, C nor D can be the correct answer and A is the right choice.
Of all the leaders listed, Xuanzong is the only one who ruled in the Tang Dynast, therefore he is the correct answer. Genghis Khan was the leader of the Mongol Empire, Yangdi was of the Sui dynasty and Huizong ruled during the Song dynasty. Therefore, neither B, C nor D can be the correct answer and A is the right choice.
