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1. The fact of being who or what a person or thing is.
or
2. a close similarity or affinity.
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The correct answer is A. reliable.
The writer was 'an authoritative source' because of her degrees, guest appearances, etc. Thus, she was a source you could rely on, she was reliable, given that she had experience to back her ideas up. Therefore A is the only correct answer.
A would be the correct answer