Correct option is C
The correct one-word substitute for the highlighted group of words is
‘stale.’
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Stale: Food that is no longer fresh and often emits a bad odor (बासी).
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Example: The bread was stale and had to be thrown away.
Meanings of the given other options:
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Brittle: Something that breaks easily (भंगुर).
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Crisp: Firm and fresh in texture, often used for food (खस्ता).
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Odourless: Without any smell (गंधहीन).