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Explanation:

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The correct answer is b. Transcontinental Railroad.

Indeed, the Bessemer Process was brought to the United States from England by two American entrepreneurs who got licenses to exploit it in America. These industrialists made several modifications that increased the process’ efficiency and speed which in turn reduced the price of steel. This process also allowed for the fabrication of steel rails which had a much higher longevity than Iron rails and this allowed locomotives to be bigger, heavier and pull more wagons than iron rails.

Andrew Carnegie opened a new steel mill called Edgar Thompson Steel Works which became one of the largest steel production companies in the world. From 100$ per ton, the cost of steel rails was reduced to 18$ per ton which allowed the Transcontinental Railroad companies to expand quickly and massively.