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.
What is a desert?
<u>An area that receives very little precipitation
</u>
or
An area where there is rain during only one month of the year
The appropriate response is Valley Forge. It was not the best place to set up winter camp for the Continental Army, as it was not able to shield southern Pennsylvania at the time. This area additionally left the defenseless under-provided armed force in the striking separation of the British, who were very much provisioned and secured in Philadelphia.
My dad said the answer is A.