Answer: Human migration is not the correct answer
Explanation:
It is trading relationships
The spread of Buddhism into China was most likely the result of the trading relationships.
Buddhism refers to the world's largest religion that is based on original teachings.
The spread of Buddhism into China was most likely the result of trading relationships as it spreads across Asia through networks of overland and maritime routes with the development of the silk routes as channels.
Therefore, B is the correct option.
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