It was always in a poster format during WWII.
Option C.
Explanation:
Propaganda was a technique which was highly used during the time of the world war II. It was mostly used by the Nazis and the government of the United States.
The aim and the purpose of using this was to convince the people of the benefits of the practices which were used by the two of these. For example the government of US made use of propaganda to convince people to buy bonds, or to join the armed forces.
