Correct option is C
The correct one-word substitute for the given group of words is
Impostor.
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Explanation: An impostor is someone who pretends to be someone else to deceive others (छलिया).
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Example: The man was exposed as an impostor after claiming to be a government official.
Meanings of other options:
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Unrecognisable: Not able to be identified (पहचाना न जा सके).
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Fraud: Deception for personal gain (धोखा).
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Inaccessible: Not reachable or not easy to approach (अप्राप्य).