Explanation: context clues are hints that an author gives to help define a difficult or unusual word within a book. The clue may appear within the same sentence as the word to which it refers or it may follow in the next sentence. One of the most common context clues are synonyms, in the given excerpt we can see an example of that, in the phrase "As sweet repose and rest" the word "rest" is a synonym of "repose" and it is a hint to understand the meaning of this last one.
The answer A because its not D bc it said nothing about animals and its not C because its about south dakota not scientists so its A Or B but A is a better choice