what point is lincoln making in this passage?

the brave men, living and dead, who struggled here, have consecrated it far above our poor power to add or detract. the world will little note nor long remember, what we say here, but it can never forget what they did here.

a. his speech should be studied and remembered

b. we should always remember the people who died at gettysburg

c. people will continue to die unless slavery is ended

d. he should be given more power to end the war