What caused the Golden Age of China"?

The 3rd option

Explanation:

I found The golden age of China was "golden" because many important inventions and advancements were made. The Song dynasty improved the government by hiring based on merit. New technology with irrigation improved food cultivation and created food surpluses. So I'm thinking the answer is the 3rd option.

hope this helps.

european feudalism was a combination of legal and military customs in medieval europe that flourished between the 9th and 15th centuries. broadly defined, it was a way of structuring society around relationships derived from the holding of land in exchange for service or labour.

japanese feudalism. the era of feudalism in japan took place from the 12th through 19th centuries. during that period local rulers, either powerful families or military warlords, dominated the land, while the emperor was merely a figurehead and not a significant political presence.