Concept:Editorial comments express the media’s own analysis and opinion on matters of public interest.
Explanation:National discourse means the public discussion of issues affecting the country.
The media enriches this discussion by offering editorial comments.
Editorial comments give background, interpretation, and reasoned opinion.
They help citizens understand different sides of national issues.
Marketing, sales, and advertisement mainly promote products or services.
Correspondents simply report facts from the field.
Only editorial comments add the depth of analysis and perspective that enriches discourse.
Answer:The correct option is B. editorial comments.