It would be
Workers had to observe strict rules and had to pay fines if they broke any.
Workers tended machines for up to 16 hours a day, with just a short break to
eat.
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Answer: Industrial Revolution
Explanation: With the advent of Industrialization and increasing production capacities of industrialized production, there was a need for more workers. Large concentration of production in cities has caused migration of the population from rural to urban areas. A large influx of population into urban centers has caused the spread of cities, i.e. urbanization. Thus migration and urbanization are one of the first results of industrial production.
C I think that the answer is c