Correct option is A
The correct antonym of the given word is
(a) Serious.
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Risible: Something that causes laughter or is laughable. (Hindi: हास्यास्पद)
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Example: His explanation for being late was so risible that no one believed him.
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Serious: Grave, earnest, or not amusing. (Hindi: गंभीर)
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Example: The teacher gave a serious warning to students for being late.
Synonyms: Amusing, comical, laughable, ridiculous.
Antonyms: Serious, grave, earnest, solemn.
Meanings of other options:
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(b) Curious: Eager to learn or know something. (Hindi: जिज्ञासु)
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(c) Droll: Amusingly odd or quirky. (Hindi: मजेदार)
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(d) Giddy: Feeling dizzy or lightheaded. (Hindi: चक्करदार)