Question

.Stephen Crane

Answer 1

Based on the contextual information provided about author Stephen Crane, the theme that the last sentence of this excerpt from his short story "The Open Boat" likely reflects is that nature is indifferent to humans.
Nature is, in this case, the tower which looms over the destiny of tiny ants, or humans, and it doesn't really care what happens to us - it exists regardless of the fact whether we are there or not to witness its glory.