The correct answer is B.
The development of cheap iron in the US was the major factor that lead to the building of skyscrapers. Being able to produce iron cheaply can be contributed to Andrew Carnegie. This American business mogul perfected the Bessemer process in several factories across the eastern part of the US. From there, he was able to sell cheap iron to American businesses for the purpose of growing their empire.
The idea that a country or region should specialise in making and exporting goods and services that it can produce most efficiently.
<span>They used images and allusions from many different cultures, past and present
Modernists artist had developed a certain level of appreciation to ethnic and cultures that exist from all period because they believe all of them contribute to the society that we see today. Because of this, they often use images and allusins from past and present.</span>
