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A. unknown soldiers

Explanation:

The cemetery at Gettysburg, known as the Gettysburg National Cemetery is the site where more than 3,000 Union soldiers were killed. They were killed in the battle of Gettysburg. Sources show that the cemetery contains the graves of 979 unknown soldiers.  

The battle that led to the creation of the cemetery took place in 1863 between Union soldiers and Confederate soldiers. Many Union soldiers were killed in the battle.

During the dedication of the cemetery, President Abraham Lincoln delivered an address which is known as the Gettysburg Address. His speech helped to serve the reminder of the sacrifices of war and the need for unity.

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