The best and most correct answer among the choices provided by the question is the fourth choice "Stock prices had risen too high because of speculation. "
The stock market crash of 1929 was not the sole cause of the Great Depression, but it did act to accelerate the global economic collapse of which it was also a symptom. By 1933, nearly half of America's banks had failed, and unemployment was approaching 15 million people, or 30 percent of the workforce.
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