D. to discuss plans for a peace treaty
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Answer:
To create public sympathy for wartime opponents.
Explanation:
Wartime propaganda can be defined as ideas, informations, allegations, or facts that are spread deliberately and methodically by a party, so as to demoralize, confuse and further it's cause against the enemy.
This ultimately implies that, wartime propaganda is focused on annihilating the will of an opponent to continue fighting in a war by ensuring that their morale is demoralized and broken down.
Hence, creating public sympathy for wartime opponents was not a purpose of wartime propaganda.
