The authority available in the hands of an author to write about a particular subject can be examined to determine the credibility of a source. Hence, the option A holds true.
The credibility of a source refers to as the dependability of a person to include about a subject or a topic in his own literary composition in order to support the claims that he or she intends to make in an argument.
If the author who has written the source is identified as a person with enough skills or knowledge about the topic or a subject, which is backed by the proof of his or her knowledge, then a reader can be sure about the credibility of a source.
Hence, option A holds true regarding the significance of credibility of a source.
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