Answer:
b) germany's secret request that mexico join the war against the united states
Explanation:
The last one, "The Native Americans fought on land they knew."
I think it is unlikely to occur and if it occurs only a small portion of Europe. The printing press becomes a significant factor of the spreading of Protestant Reformation due to the access of information is much easier and effective to transmit around rather than word of mouth. The prints also are easier and cheap to produce.
