The main idea of the speech is that the brave men died fighting a war that will test the strength of the nation. This speech of Abraham Lincoln shows their bravery in the war. Hence, the correct option is C.
At the time it was delivered, the Gettysburg Address' major goal was to honor a brand-new national cemetery in Gettysburg. Additionally, it clarified Lincoln's motivation for fighting on to end the Civil War: the abolition of slavery and the union's reunification.
Lincoln urges the living to decide to do three things in his Gettysburg Address: first, "that these dead shall not have died in vain;" second, "that this nation, under God, shall have a new birth of freedom; and third, "that government of the people, by the people, for the people, shall not perish from the earth."
It concluded that even though we want to end the war peacefully but those who died will showcase the bravery of nation regarding the war.
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