Correct option is C
The correct synonym of the given word is "refrain".
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Desist: To stop doing something or to abstain from an action (किसी कार्य से बचना या रुक जाना).
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Example: The police ordered the protesters to desist from blocking the road.
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Refrain: To hold oneself back from doing something (स्वयं को किसी कार्य से रोकना).
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Example: He refrained from making any negative comments.
Synonyms: Abstain, avoid, cease, forbear.
Antonyms: Continue, persist, proceed, indulge.
Meanings of all the other given options:
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Show – To display something (दिखाना); does not convey the meaning of stopping an action.
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Pledge – To promise something (प्रतिज्ञा करना); does not fit the meaning of "desist."
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Insist – To demand forcefully (ज़ोर देना); opposite in meaning to "desist."