Answer:
c. has fallen dramatically in the last few years, with Internet ad sales unable to fill the gap
Explanation:
Newspaper is the most old source of information and country wide updates to human beings.
But with evolution of time, and introduction of internet, people have started using it more, and that the feed of newspaper deliver things late.
Thus, people have switched to internet for information, and also the advertising companies, as the audience is more on internet.
Thus, this clearly depicts that the revenue of newspapers have fallen down because of the rising spread of internet and its increasing users.