Answer:
The correct answer is "A. featured articles".
Step-by-step explanation:
Featured articles represent the ones that the responsible person has highlighted as important, or even the ones which people have read and commented the most. They are the most refined ones among the other options because "reference articles" are based on just one person or a small group of people's opinion, "content portal" refer to any content page, and "daily articles" may be any informative or argumentative articles. Featured articles represent how much people have interacted with them and, therefore, how much it contributes.