Answer:
D, help figuring out unfamiliar words.
Step-by-step explanation:
Important plot details wouldn't usually be found in context clues.
Details that show style have nothing to do with the story, so there's no reason to figure that out with context clues.
hints are thrown at you randomly, and don't appear in context clues because context clues help you figure out what a word means.
Context clues have the meanng of the word inside the sentence, so D would be the answer.