Answer:
The imagery in the lines suggests that great deeds are remembered in history.
Step-by-step explanation:
Henry Wadsworth Longfellow's poem "A Psalm of Life" talks of life in general and how it is like a battlefield. The poet talks of the purpose of life and how one can live a life that is filled with sorrow and suffering along the way. Nevertheless, the poet also reveals an optimistic side of living and that one can leave a "footprint" by doing good deeds.
In the given lines from the poem, the speaker mentions how "lives of great men all remind us we can make our lives sublime". He then uses imagery to reveal the "footprints on the sands of time". This imagery suggests that history will always remember the great deeds of people, no matter how many years passed.
Thus, the correct answer is the second option.