The event that happened before the pacific railroad act was signed in 1862 as a whitney asked for the right to build a transcontinental railroad. Hence, option A is correct.
A number of congressional actions known as the Pacific Railroad Acts of 1862 encouraged the building of a "transcontinental railroad" in the United States by allowing the issue of government bonds and the granting of land to railroad companies. The Pacific Railway Act, which went into effect on July 1, 1862, provided financial aid to "men of skill, men of character, and men who are ready to invest" in the construction of the country's first transcontinental train route. The relative seclusion of the CP's California terminal was another drawback. Transporting iron rails and other supplies from the eastern half of the country would not be simple, despite the Pacific Railroad Act's requirement that all iron used on the project be manufactured in the United States.
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