Out of Many, One: Rhetoric in The Gettysburg Address and "O Captain! My Captain!" Answers

Which extended metaphor does Whitman use throughout "O Captain! My Captain!?"

Read these excerpts.Lincoln’s "The Gettysburg Address."It is rather for us to be here dedicated to the great task remaining before us – that from these honored dead we take increased devotion to that cause for which they gave the last full measure of devotion – that we here highly resolve that these dead shall not have died in vain – that this nation, under God, shall have a new birth of freedom – and that government of the people, by the people, for the people, shall not perish from this earth.Whitman’s "O Captain! My Captain!".My Captain does not answer, his lips are pale and still;My father does not feel my arm, he has no pulse nor will;The ship is anchor'd safe and sound, its voyage closed and done;From fearful trip, the victor ship, comes in with object won;Exult, O shores, and ring, O bells!But I, with mournful tread,Walk the deck my Captain lies,Fallen cold and dead.

Read this line from "O Captain! My Captain!".O Captain! my Captain! our fearful trip is done;

Which statement best describes the significance of comparing Lincoln’s death to the death of a captain on his ship in "O Captain! My Captain!"?