Correct option is A
The correct synonym of the given word is (a)
Curious.
Inquisitive: Eager to know or learn something; showing curiosity. Often implies asking too many questions. (Hindi: जिज्ञासु)
Example: The child was so inquisitive that he asked questions about everything he saw.
Curious: Having a strong desire to learn or know more. (Hindi: जिज्ञासु, उत्सुक)
Example: She was curious about the new technology.
Synonyms: curious, probing, questioning, inquiring
Antonyms: uninterested, indifferent, unconcerned
Meanings of all the other options:
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Callous – Emotionally insensitive or cruel. (निर्दयी)
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Agile – Able to move quickly and easily. (फुर्तीला)
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Aloof – Not friendly or forthcoming. (उदासीन, अलग-थलग)