What effect does the opening sentence have on Lincoln’s message in the speech?

Group of answer choices

A. It encourages listeners to remember that the Founding Fathers knew that slavery should not exist in their nation.

B. It conveys a tone of great sadness, emphasizing the tragedy of so many lives being lost in the Civil War.

C. It portrays the Civil War as a continuation of the United States’ enduring commitment to liberty and equality.

D. It emphasizes how the United States lost the ideals of liberty and freedom fought for by the Founding Fathers.