Which of these famous advertising slogans was created as part of a World War II campaign to discourage careless talk that might reveal sensitive information to enemy spies?

Throughout history, certain advertising slogans have become so powerful they've transcended their original marketing purpose to become cultural touchstones. Some have even influenced historical events or reflected pivotal moments in time. This poll tests your knowledge of iconic historical advertising slogans that had significant cultural or historical impact. Can you identify which campaign was used to support a major wartime effort?

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Loose Lips Sink Ships
A Diamond Is Forever
We Try Harder
Think Small