Answer :
I'd say D, because that allows the Union to easily get supplies and troops to the battlefield and back, while the Confederacy has to travel by foot, which is tiring and takes a long time. Also, if the Confederacy runs out of supplies during a battle, they will not be able to get supplies again quickly.
The North had a more widespread network of railroads available for delivering troops and supplies to the battlefield is the statements best describes one of the Union's advantages over the Confederacy during the Civil War. Hence, option D is correct.
Why North had a more widespread network of railroads?
The Confederacy must travel by foot, which is laborious and takes a long time, the Union can easily convey supplies and troops to the battlefield and back. Additionally, the Confederacy won't be able to obtain supplies quickly if they run out during a combat.
The network of railroad was made easy to transport the goods from the one cities to another, especially the weapons and battlefield supplies that are required in the ongoing war at that time.
Thus, option D is correct.
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