It was the fact that they bought up multiple productions
The French Revolution was the first democratic revolution in Europe that actually gave birth to a stable democratic state. Foremost it is seen as the beginning of the democratization of Europe.
It would be the population increased. The Neolithic Revolution was the period in which people, at the time mostly nomads, gradually adapted a sedentary lifestyle, leading to population increase.
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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.