I believe its B.Let the peer reviewer know which specific issues to look for in your essay
Answer:
A complete sentence
Explanation:
Its a complete sentence because it has a subject and a verb.
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.