Answer:
In the United States, <em>the Office of War Information </em>was founded in 1942, with a purpose to deliver the government's message via different types of propaganda.
The Office thus produced posters, pamphlets, movies, radio shows, which involved the recruitment of filmmakers and advertisers, only with one goal - to persuade people to join the war. During the World War II, posters could be found everywhere - in the railway stations, buildings, schools and hospitals, post offices, etc. These propaganda tools (posters, movies) were combined with specific types of propaganda designed to appeal to the audience -<em> bandwagon, name-calling, euphemism</em>, etc. While some posters delivered positive messages, other posters were dark and frightening. The latter pointed out the terrible outcomes that other countries faced in the lack of war effort. Phrases such as: <em>"When you ride alone, you ride with Hitler” </em>or<em>“Loose lips might sink ships” </em>could be seen on them. Some of the posters attempted to awaken people's patriotic feelings: <em>"Join the war and be a good American." </em>The idea was, thus, to persuade the population that it is absolutely necessary for people to be behind the war effort.
The correct answer is C. The evidence textual offers the information to build the main idea. It also means that they are connected but they are different. The main idea has no sense without textual evidence. So, The main idea became the main idea because of the lack of textual evidence or the lack of pieces of information for that.
