Witch of the following contributed greatly to the fall of the Song Dynasty? A. The invention of gunpowder B. The increase in the Chinese population C. The improvement of the civil service system D. The vulnerability to invaders from the north

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Right Answer: A. The invention of gunpowder 

Why? Because with the invention of gunpowder wars were a lot more bloodier and caused more damage which made it end 

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Answer: the right answer is the vulnerability to invaders so D

Explanation: I took the test