Correct option is A
The correct synonym of the given word is (a)
Gamble.
Wager: An act of betting or staking something on the outcome of an event. (शर्त लगाना)
Example: He placed a wager on the horse race.
Gamble: To risk money or valuables on an uncertain outcome. (जुआ खेलना/शर्त लगाना)
Example: She gambled all her savings on that startup idea.
Synonyms: bet, stake, risk, venture.
Antonyms: guarantee, save, secure.
Meanings of other options:
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(b) Scrutinize: Examine closely (जांच करना)
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(c) Scrupulous: Very careful or moral (ईमानदार, सजग)
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(d) Crumble: To break into small pieces (टुकड़े होना)