Yellow journalism was a term used to describe the muckrakers who expose the dark sides of businesses and government.
a. true..
b. false..
answer asap !

The answer is true 

The term muckraker was used in the Progressive Era to characterize reform-minded American journalists who attacked established institutions and leaders as corrupt. They typically had large audiences in some popular magazines. In the USA, the modern term is investigative journalism — it has different and more pejorative connotations in British English — and investigative journalists in the USA today are often informally called 'muckrakers'. Muckraking magazines—notably McClure's of publisher S. S. McClure—took on corporate monopolies and political machines while trying to raise public awareness and anger at urban poverty, unsafe working conditions, prostitution, and child labor.