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Generally, there were two major factors that led to the decline of the Yuan Dynasty: one was the class conflict caused by the heavy taxation, the other one was the ethnic contradiction resulting from the 'Four Class System'. ... Also, power struggles within the ruling class became more and more serious.

Answer:

Failed military campaigns

Explanation:

The Mongols repeatedly tired and failed to conquer the Sung dynasty.  The Sung had greater numbers and walled cities - so the Mongols could not beat them.  Therefore the answer - out of the options on the quiz - is "Failed military campaigns"

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