Answer: In the poster "A Key to Victory: Lock Your Lips", the appeals used are fear and patriotism. The use of the key symbolizes the importance of keeping information secure, while the message "Lock Your Lips" creates a sense of urgency and fear of the consequences of loose talk. Additionally, the use of the word "Victory" appeals to the patriotism of the American people, emphasizing their duty to protect the nation and support the war effort.
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