Answer:
A. to describe the character’s conflict with the setting
Step-by-step explanation:
In this excerpt from Heart of Darkness, the narrator puts the accent on the surroundings, and how unpleasant it is. It gives the feeling of being lost in the prehuman era when nature and wilderness dominated, but in a negative sense. The feeling was even more intensive since the narrator traveled alone, and being alone in a, from a traveler`s point of view, hostile environment with wild animals like alligators, warm air that seems like it is unbreathable and awareness like you are in some enchanted trap where there is no way out, made the narrator feel a little bit anxious, though a man in greatness and infinity of nature is just a grain of sand, and that is even scarier.