We can actually deduce here that the word that is most similar in meaning to idle as it is used in the paragraph is: D. unproductive.
Context clues are actually seen as the hints that directs one to the actually answer. Context clues are seen within the body of a paragraph, passage, text or story. They are pointers to the actual thing one is looking.
Context clues can be identified as the words or sentences that surround the actual thing one is searching for. Then they help such one to easily locate them.
We can see here that "idle" is most similar to "unproductive". One that is idle cannot be productive. Thus, the answer is unproductive.
Learn more about context clues on https://brainly.com/question/11247029
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