The method which increased the spread of religion and new ideas between China and Japan in the 500s BCE is:
The method through which religion spread greatly between the countries of Japan and China in 500 BCE was through trade in the Silk Road.
As a result of this, there was trade between the merchants as they exchanged one piece of item for another and trade flourished.
This was a good opportunity to spread religion as the religions such as Buddhism, Islam and many others became very popular among the merchants.
Therefore, the correct answer is option C
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