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What led to the Great Depression, referred to as the 'Dirty Thirties'?

  1. The 1929 stock market crash

  2. World War I

  3. The Spanish Flu pandemic

  4. The discovery of penicillin

The correct answer is: The 1929 stock market crash

The Great Depression, also known as the 'Dirty Thirties', was caused by the 1929 stock market crash. This event triggered a chain reaction that led to widespread economic hardship and high unemployment rates. While World War I and the Spanish Flu pandemic did occur in the years prior to the Great Depression, they were not the direct cause of it. The discovery of penicillin also did not have any significant impact on the economy at the time. Therefore, A is the best answer as it directly addresses the specific event that led to the Great Depression.