Correct option is D
The correct antonym of the given word is
(d) Appropriate.
Incongruous: Something that does not fit in or is not in harmony with the surroundings or circumstances. (विषम / असंगत)
Example: His colorful tie seemed incongruous with the formal dress code.
Appropriate: Suitable or proper in the circumstances. (उचित / उपयुक्त)
Example: Please wear appropriate clothing for the wedding.
Synonyms: inconsistent, unsuitable, absurd, unfit.
Antonyms: appropriate, fitting, consistent, suitable.
Meanings of all the other given options:
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(a) Jarring: Clashing or shocking (अप्रिय, टकराने वाला)
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(b) Fettered: Restrained or chained (जकड़ा हुआ)
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(c) Unharmonious: Not in harmony (असामंजस्यपूर्ण)