During the Second Industrial Revolution, important aspects that changed the way of production, the attitude towards the labor force, the transport of goods are among others: railways, steel, textiles, health care workers, as well as the patents such as electricity, light bulbs. All this influenced the increase in production, further demand for labor, improving working conditions, faster urbanization and easier transportation especially when the rail is in question because the goods could be transported to long distances without any problems for further overseas transport.
The answer is: A.