The answer is c. commentator. They are also called pundits. This type of commenter provides their opinion and analysis to a certain subject on mass media. There are also political and social commentators who observe advocacy journalism where they take an impartial stance on social or political points of view. Though they claim to be impartial, it is obvious that their analysis and opinions sometimes reflect that political views of their network or company. It can be seen on how they analyze a person or an event and where they stand on that issue.