The proposed routes for the Transcontinental Railroad are Emigrant Route, Southern Route, and Northern Route. Option D is correct. This is further explained below.
What is a Transcontinental Railroad?
Generally, Transcontinental Railroad is a railroad tasked with delivering western agricultural crops and raw resources to East Coast markets, as well as manufactured commodities from East Coast cities to the West Coast.
In conclusion, The Transcontinental Railroad's intended routes are the Emigrant Route, the Southern Route, and the Northern Route.
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