The answer should be Duel federalism
Generally speaking, it would be earthquakes that do not threaten Central America, due to the fact that there are no major fault lines, although they are still technically possible.
This is usually the result of an underdeveloped infrastructure or lack of technological achievements. The communication revolution requires countries to have highly advanced infrastructure that can support making a huge communications web and many countries have historically been destroyed by wars or have generally been poor and couldn't develop in that field, which means that nowadays they can't enter it quickly.
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I believe the answer is D) the invasion of Dorking by a German-speaking army. “The Battle of Dorking” was a short story by Chesney that explored a future war genre. H.G. Wells then developed this template of writing.
Explanation:
Hope it helps!