Answer:
I believe the third option is the best one:
"We have come to dedicate a portion of that field, as a final resting place for those who here gave their lives that that nation might live."
Explanation:
The excerpts in the question were taken from Abraham's Lincoln famous speech known as the Gettysburg Address. Even though it was short speech, it entered history as beautifully structured and incredibly inspiring. The main purpose of the speech was to honor the soldiers who died in the Civil War by dedicating a piece of land to them. From that one, other purposes were derived such as to inspire people to keep on fighting to prevent their country from being divided. The excerpts among which we have to choose do not work as evidence with the exception of the third one. It is the only excerpt that makes it clear that the purpose of that moment is to honor the fallen soldiers.
