Answer:
to create a mysterious mood .
to show the location .
to reveal that Rainsford is a hunter .
to show the time of day.
Step-by-step explanation:
Richard Connell's short story The Most Dangerous Game revolves around the theme of hunting and the imaginary line/relationship between the hunter and the hunted. And in this story, this relationship fluctuates and also led to the most dangerous game being played between two famed hunters.
Based on the options given in the question, it can be deduced that the dialogue mentioned is that of between Sanger Rainsford and his friend Whitney. And the only time Whitney appears n the story is at the beginning where he talks about the "Ship-Trap Island". So, judging by that conversation from the start of the story, we can assume that the purpose of the dialogue is to first create a mysterious mood about the island "off there to the right". It also reveals their location along the journey and gave us a hint of how expert and famed a hunter Rainsford is. The mention of "dark tropical night" and "moonless Caribbean night" also suggests the time of day they were traveling.
Thus, the correct answers are all the options except for the fourth option. It contains no detail about what Whitney looks like.