Correct option is A
The correct antonym of the given word is (a)
Dynamic.
Lethargic: feeling sluggish or lacking energy. (Hindi: सुस्त, थका हुआ)
Example: After a heavy lunch, I usually feel lethargic.
Dynamic: full of energy and new ideas. (Hindi: ऊर्जावान, सक्रिय)
Example: She is a dynamic leader who inspires her team.
Synonyms of Lethargic: sluggish, drowsy, inactive.
Antonyms of Lethargic: dynamic, energetic, active.
Meanings of other options:
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(b) Sleepy – drowsy (नींद में)
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(c) Sluggish – slow-moving (धीमा, सुस्त)
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(d) Dull – boring or lacking brightness (बेजान)