How does the author best develop the central idea over the course of the text "Citizen Journalism"?

by explaining that with the use of podcasts and blogs, citizen journalists can report happenings from anywhere and at any time.

by explaining how citizen journalism is on the rise in China because the government attempts to keep journalists from reporting on issues

by providing examples of the ways in which ordinary citizens have used social media to report on corruption and abuses that would normally be hidden

by giving an account of how Zhou revealed the corruption by the mayor of Lanzhou, China, through the use of photographs showing the mayor wearing expensive watches