A word or a phrase that is informal and particular to certain time periods or social situations is called a slang term.
What is a slang term?
A slang term can be regarded use of such words phrases in a sentence that are not as per the original language. A slang term does not follow grammatical correctness.
The language and tone of a slang term that is used in a sentence is informal in nature. Moreover, it may change with change in social surroundings and time periods.
Hence, option C states about a slang term.
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