Correct option is D
Option (d) is the correct meaning of the given idiom "a black sheep."
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A black sheep" typically refers to a member of a group (usually a family) who is considered undesirable or disreputable.
Example: He became the black sheep of the family after he was caught embezzling funds.
Other options:
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A crying wolf - Refers to someone who raises a false alarm or repeatedly warns of danger when there is none, based on the fable "The Boy Who Cried Wolf."
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A dark horse - Describes someone who is little known but unexpectedly wins or succeeds, especially in a competition or election.
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A fish out of water - Refers to someone who feels uncomfortable or out of place in a particular situation or environment.