Correct option is B
The correct antonym of the given word is (b)
Authentic.
Spurious: not genuine; false or fake. (Hindi: नकली / झूठा)
Example: He was arrested for selling spurious medicines.
Authentic: genuine; real or true. (Hindi: असली / प्रमाणिक)
Example: This is an authentic Mughal-era manuscript.
Synonyms of Spurious: fake, counterfeit, bogus.
Antonyms of Spurious: authentic, genuine, real, legitimate.
Meanings of the other options:
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(a) Fake – Not genuine (नकली)
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(c) Counterfeit – Made to deceive (जाली)
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(d) Bogus – False or deceptive (झूठा)