Replace the underlined segment with the most appropriate idiom/phrase from the following options.
This is the critical point of the issue. One should always be focused on it.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. The crux of the matter.
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The most appropriate idiom to replace the underlined segment in the given sentence is "the crux of the matter."
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The corrected sentence would be: "This is the crux of the issue. One should always be focused on it."
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Using "the crux of the matter" in this context emphasizes that the point being discussed is the most important or central aspect of the issue.