What was one reason why Martin Luther's ideas to reform the church gain popularity? A: He was a famous Cardinal that served the Pope
B: Martin Luther's ideas originated inside the Vatican City
C: Everyone knew how to read and write in Latin
D: His "Ninety-Five-Theses" could be mass produced because of the printing press

I believe the answer is D.

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explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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