Correct option is B
The correct antonym of the given word is (b)
Modest.
Vain: Having or showing an excessively high opinion of one’s appearance, abilities, or worth. (अहंकारी / घमंडी)
Example: He’s too vain to admit his mistake.
Modest: Humble in one’s abilities or achievements; not boastful. (विनम्र / नम्र)
Example: Despite his success, he remains modest.
Synonyms: conceited, arrogant, self-centered, boastful.
Antonyms: humble, modest, self-effacing, down-to-earth.
Meanings of other options:
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(a) Loyal: faithful (वफादार)
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(c) Unfair: unjust (अनुचित)
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(d) Energetic: full of energy (ऊर्जावान)