I Think The Answer Is outta A or B
Now the knowledge about historical events is almost automatically updated and hierarchically set in the Internet. All the new information we have to find in one place. We have many sources of information that describe one event from different angles. Finally, the technology allows to play back events, e.g. battles, which allows to better understand the context.
I believe the the answer is C. A difficult journey to get there.
I hope this helps!
Cold War
The Cold War was an open yet restricted rivalry that came after World War II between the United States (Western democracies) and the Soviet Union (communist nations) and their respective allies. The Cold War was based on political, economic, and propaganda fronts and had only limited recourse to weapons.