A statistic that supports a claim is an information for which a writer should provide a source. Therefore, option C holds true regarding a source.
A source is a something, which denotes who owns the actual credit for owing such data, and also denotes the credibility of the source from which the data or information has actually been extracted by the author to include in his own literary composition.
There is no need of a source when an author has described something that he or she saw, or when he mentions a general statement. Similarly, a conclusion is also not worth mentioning, the credibility of the conclusion. Only a statistic is something that shall be cited with a source to support the claim, and mention its credibility.
Hence, option C holds true regarding a source.
Learn more about a source here:
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