What was the purpose of this type of propaganda poster?

to advocate a peaceful end to the war

to intimidate Germany with a show of Allied strength

to gain neutral nations' support in the war effort

to convince citizens to sacrifice for the war

Option-(D,C): "The purpose of the propaganda poster was to gain neutral nations' support in the war effort  and  to convince citizens to sacrifice for the war."War requires nations to sacrifice themselves for the cause of good, as there were a number of nations or we can say that there were people across the globe who wanted a more neutral role inside the "War I", while the people inside the US wanted no part in the war at first but they were then forced by the propaganda's to sacrifice there money and more over lives for the cause war against the Germans. Along, with which there were nations across the globe who were tempted by these posters or we can say campaigns to take some part in the war against the Germans.

Communicating with the dead was common, it wasn’t seen as bizarre or weird,” explains murch. “it’s hard to imagine that now, we look at that and think, ‘why are you opening the gates of hell? ’