Correct option is D
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Meaning of "Constant": Something that does not change.
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Synonyms: Fixed, stable, unchanging.
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Antonyms: Changing, fluctuating, variable.
Meanings of Options:
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Changing: Becoming different (बदलता हुआ).
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Flowing: Moving smoothly and continuously (बहता हुआ).
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Moving: Going from one place to another (गति में).
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Fixed: Stuck in one place, not changing (स्थिर).