The correct answer here would be the option C.
The United States since the Industrial Revolution have been an industrial and manufacturing society. But, over the years their industry shifted from manufacturing to services, as now instead of factories the large number of people is employed in the service industry. The shift happened among other things, the cheaper labor in different countries where the factory owners have decided to set up shop.
Oil-based economy refers to the world's dependency on petroleum, natural gas and coal for energy. Electricity, diesel fuel, gasoline and kerosene are only some of the commodities that are provided by oil. However, there are negative effects of the processing to the environment. Combustion of oil by cars yield sulfur oxides, nitric oxides and carbon dioxide that participate in ozone depletion and global warming. Therefore, the more-developed nations are working on better technologies to harness renewable energy for sustainability. These energy refer to solar, hydropower, wind, and tidal resources. As of now, there are problems on the cost of developing and perfecting these technologies to maximize the energy source. Unfortunately, if the world shifts to the clean energy-economy, the less developed countries would have to catch up a great deal. These equipment are quite expensive, so for a time-being, only the more developed countries would participate and earn from it.
<span>During the Middle Ages, merchants, artisans, and their guilds contributed to the
rise of towns. They helped accumulate wealth, then would pay taxes, then the cities would grow. They were of high importance for the creation of large cities.</span>
