Which sentence or phrase reflects the theme that nature is indifferent to the troubles of man in this excerpt from "the open boat" by stephen crane?

The answer is:
Sometimes he whirled down the incline of a wave as if he were on a hand sled.  

Stephen Crane’s “The Open Boat” tells a story of a man’s relationship with nature. A man would think that he is just a speck in the universe and that nature does not find him important. Nature would feel that eliminating the man would not alter the universe. It’s how insignificant man is.