The facts and evidence basically the Precedents
Unlike balanced forces, unbalanced forces always cause a change in motion. They are not equal and opposite. When two unbalanced forces are exerted in opposite directions, their combined force is equal to the difference between the two forces and is exerted in the direction of the larger force.
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.
