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. 

C.  state representation in Congress

Explanation:

The Virginia Plan proposed a bicameral legislature where the members of both Houses would be determined proportionally. The lower house would be chosen by the population of some states and the upper house would be chosen by the lower house appointed by state legislatures.

The New Jersey Plan was a response to the Virginia Plan because it was thought that if the government or the larger states were given too much power, and smaller states would have little influence on future issues in the country. So the main difference was to achieve state representation in Congress