Hush (noun): a stillness; a silence The usage in I is incorrect. II. "The teacher tried to hush the students to make them more active during the class discussion." Sentences II also uses the word incorrectly. "Hush" actually means to make something quiet, not to make it more active or lively. The correct word to use here would be something like "energize" or "encourage." Only III uses the word correctly. Hence, option D is the correct answer.
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