Which sentence in this excerpt from Stephen Crane's "The Open Boat" is a metaphor that reflects the naturalistic theme that human life is insignificant before the workings of fate? "The boat was headed for the beach. The correspondent wondered if none ever ascended the tall wind tower, and if then they never looked seaward. This tower was a giant, standing with its back to the plight of the ants. It represented in a degree, to the correspondent, the serenity of nature amid the struggles of the individual." "The coldness of the water was sad; it was tragic. This fact was somehow so mixed and confused with his opinion of his own situation that it seemed almost a proper reason for tears. The water was cold.