Correct option is B
The correct one-word substitution is
(b) Extravagant.
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Definition: Someone who spends money recklessly, often on luxuries or unnecessary items.
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Extravagant (Hindi meaning): फिजूलखर्ची करने वाला.
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Example: His extravagant lifestyle left him with no savings.
Meanings of other options:
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Extempore: Spoken or done without preparation (तुरंत, बिना तैयारी के).
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Thrifty: Using resources carefully and not wastefully (मितव्ययी).
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Miser: A person who hoards wealth and spends as little as possible (कंजूस).