A news article that "sells" an idea is a?

A. an editorial

B. a byline

C. a syndicated feature

the answer is c

Most likely c, but it all depends

Explanation:

definitly NOT B

A is an editorial, leading article or leader, is an article written by the senior editorial staff or publisher of a newspaper, magazine, or any other written document, often unsigned.

C is a feature syndicate is a supplier offering an often quite considerable menu of comics, editorial cartoons, columns, and other features for newspapers across the country.