Why was the country-wide spread of a postal system and paper currency important to China? Select one:
a. to spread the image of the emperor through stamps and coinage
b. to give jobs to Chinese postal workers and bankers
c. to keep news and wealth flowing throughout the country
d. to unite the Chinese people

D. to unite the Chinese people

Explanation:

Before the creation of paper currency, Chinese people conducted their business through a barter system. To obtain a certain good from another people, a person need to exchange with another good that he own.

This system is really problematic because different regions in China used different methods to give valuation toward a certain product. In the end, many people did not want to trade with people who lived in another region because they feared that the goods that they obtain wouldn't have a fair value than they've exchanged.

The creation of paper currency made the valuation of a product became universally accepted in all region.

This made people from different regions interact with each other more and gradually united Chinese people simply through social interactions between them.

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