Correct option is D
The correct one-word for the given group of words is (d) Obsolete.
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Explanation: Obsolete means no longer in use or no longer relevant, often due to being outdated. (Hindi meaning: प्राचीन, अप्रचलित)
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Example: Many old mobile models have become obsolete due to new technologies.
Meanings of the given other options:
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Option (a) Omnipotent: All-powerful (सर्वशक्तिमान)
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Option (b) Outpour: A strong or sudden expression of feelings or words (अचानक प्रकट होना)
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Option (c) Obscure: Not easily understood or not well known (अस्पष्ट)