Correct option is B
The correct synonym of the given word is (b)
Liking.
Penchant: A strong or habitual liking for something or a tendency to do something. (किसी चीज़ के प्रति झुकाव या पसंद)
Example: She has a penchant for classical music.
Liking: A feeling of fondness or preference for something. (पसंद)
Example: He has a strong liking for spicy food.
Synonyms: inclination, fondness, preference, partiality.
Antonyms: aversion, dislike, indifference, hatred.
Meanings of all the other given options:
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(a) Bitterness: Sharpness of taste or anger/resentment. (कड़वाहट/कटुता)
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(c) Sourness: The quality of having a sour taste or attitude. (खट्टापन/कटुता)
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(d) Disliking: A feeling of not liking or being averse to something. (नापसंदगी)