Answer: B. by working together voluntarily
In 1883, railroad companies were able to standardize their timetables. One of the best practice that they did is that they work together voluntarily for the welfare of the majority. It is the unity that they were able to construct that made the standardization of their timetables.
The Schlieffen Plan was created by General Count Alfred von Schlieffen in December 1905. The Schlieffen Plan was the operational plan for a designated attack on France once Russia, in response to international tension, had started to mobilise her forces near the German border
A nuclear war between the U.S. and the U.S.U almost became a reality because the Soviet Union stuck missiles in Cuba... I think thats right :)