True false after the fall of the han dynasty, daoism became politically vibrant as various elites sought to use daoism to justify their political dominance.

This is false. There was religious tolerance and many factions existed based on different religions. Daoism was never a political thing but a highly spiritual one and it was a part of Chinese culture since its inception and still is today. However, it's different now than then but it is similar.

The correct answer is the hindu kush mountains.