D. Sensuous drowsiness.
Richard Connell's short story "The Most Dangerous Game" revolves around the theme of hunter and prey. The complicated relationship of the hunter and the hunted, the conflict for survival and the need to hunt are all seen in the story.
The given passage is from the initial parts of the story where Sanger Rainsford and his friend Whitney are on the steamer on their way to the hunting expedition. From the passage, the use of the word "indolently" can be understood from the words "sensuous drowsiness", which suggests that he is adverse to the very word.
Here, he is shown to be not sleepy, but then the next sentence follows with the word "sensuous drowsiness of the night" which is contrary to each other.
It is languidly.
Does this help?
The answer is D: sensuous drowsiness. The picture in the passage is of Rainsford denying that he is sleepy and intends to smoke another pipe. When he is on the afterdeck, that reclining chair invites him to just relax, no effort is required to enjoy his favorite brier, indolently. It felt so at ease and pleasantly to get caught by this drowsiness of the night.