Correct option is D
The correct antonym of the given word is (d)
Active.
Idle: means not working, not involved in any productive activity. (Hindi: निष्क्रिय)
Example: He remained idle during the vacation.
Active: means doing things; engaged in activity or movement. (Hindi: सक्रिय)
Example: She is an active participant in all extracurricular activities.
Synonyms of Idle: inactive, lazy, dormant.
Antonyms of Idle: active, engaged, busy, industrious.
Meanings of other options:
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(a) Brave – Courageous (बहादुर)
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(b) Rude – Impolite (असभ्य)
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(c) Lucky – Fortunate (भाग्यशाली)