Answer:
I suggest listing the digital sources you're asking about so people know what exactly you're referring to and can help you easier with this.
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.
The third option is correct
Answer:
D are shining examples for us to follow
Explanation: