Correct option is B
Option (b) is the correct meaning of the given idiom.
Not one’s cup of tea: Something that one does not enjoy or is not interested in. (किसी की पसंद या रुचि की चीज़ नहीं)
Example: Classical music is not my cup of tea.
Other related idioms:
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Fish out of water – Out of one’s usual environment.
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Hit the nail on the head – To do or say something exactly right.
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Out of your league – Beyond your ability or status.