Anews article that “sells” an idea is a ?

a. an editorial
b. a byline
c. a syndicated feature

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.

faith or loyalty when pledged in a solemn agreement or undertaking.

b

explanation: