The right answer is D) Railroad construction companies were heavily subsidized with money and land grants from the federal government.
The operation and development of the railroad were so striking to the American economy that it was considered to be the greatest technological achievement of the nineteenth century in the US. In addition, it was an accurate solution to link business and travel between the West and the East, the economy and helping the United States to be one of the world's first powers. Authorization for the construction of the railroad came through The Pacific Railroad Act, in 1862, with the support of the United States government. Works began while Abraham Lincoln presided over the U.S., but the project was only completed after his death. The highways were only possible through bidding and accords for lands and means of production, conceded by the federal government.
