In the Great War, governments used propaganda posters as a means of justifying their involvement in the conflict, but also as a means of recruiting men, money, and other resources to sustain the military campaign.
Advertising is becoming more and more sophisticated and is increasingly using advertising. It is about manipulating consciences, "selling ideas." In light of this, we can divide propaganda into two groups into "white propaganda," when one knows the source and the "black propaganda" or "counter propaganda" whose aim is the disinformation that comes from the "enemy". In the period of the Great War the press was used as a means of publicizing propaganda, that is, for the implementation of ideas, along with terror, torture, and genocide.
As we can see, the right answer is C, They used newsreels and posters to stir up emotions.