Powerful entities and organizations communicate most often to the masses via
a. telephone
c. word of mouth
b. the media
d. libraries

Let's think of an example for such an organization: United  Nations, The European Union, NATO. How would you expect them to communicate with the masses?

The most likely options are either through posters, TV advertisements or press conferences seen in the TV. This means that they communicate through the media - answer b. 

There is lots of evidence