Which word is closest in meaning to ‘Castigate’?

Correct option is D

The correct synonym of the given word is (d) Condemn.
Given word — Castigate: severe criticism or punishment; to reprimand harshly, often with the intent to correct behavior. (Hindi: कड़ी निंदा करना / कठोर फटकारना).
Example (given word): The coach castigated the team for their careless mistakes.
Correct answer word — Condemn: to express strong disapproval of; to denounce as wrong or evil, sometimes with an official or moral judgment. (Hindi: निंदा करना / दोष देना / धिक्कारना).
Example (correct answer): The committee condemned the unethical practices of the firm.
Synonyms: rebuke, censure, reprimand, lambaste.
Antonyms: praise, commend, applaud, approve.
Meanings of all the other given options:
• (a) Vague — not clearly expressed or defined (Hindi: अस्पष्ट / धुंधला).
• (b) Dull — lacking interest/brightness; not sharp (Hindi: नीरस / कुंद).
• (c) Dark — with little or no light; gloomy (Hindi: अंधकारमय / उदास).
These do not convey the notion of strong disapproval/criticism, which condemn does and thus best matches castigate.