Correct option is A
The correct one-word substitute for the given group of words is
Edible.
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Explanation: "Edible" means something that can be eaten without causing harm (खाने योग्य).
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Example: The berries are edible and can be consumed raw.
Meanings of other options:
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Unpalatable: Something unpleasant to taste or eat (अस्वादिष्ट).
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Uneatable: Something that cannot be eaten due to being unsuitable (अखाद्य).
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Toxic: Poisonous or harmful (विषैला).