Answer :
Genghis Khan was the founder and first Great Khan (Emperor) of the Mongol Empire, which became the largest contiguous empire in history after his death.
Hence the sentence that is not true about him is that he used terror tactics in his conquests.
Genghis Khan's personality
Genghis Khan was also portrayed positively by early Renaissance sources out of respect for the great spread of culture, technology and ideas along the Silk Road under the Mongol Empire. By the end of the Great Khan's life, the Mongol Empire occupied a substantial portion of Central Asia and China. Due to his exceptional military successes, Genghis Khan is often considered to be one of the greatest conquerors of all time.
Therefore, option D is the correct answer.
learn more about Genghis Khan: https://brainly.com/question/24018