The correct answer is B) instability of America's financial house.
The Great Depression was caused by instability of America's financial house.
On October 1929, something bad happened in the United States that affected the economy and the social life in the nation for the next 10 years: the Great Depression. The Great Depression resulted after the US stock market crashed in October 1929. Thousands of people lost their jobs, many companies closed and many banks declared bankruptcy. This was the worst moment in the economy of the United States. The Great Depression ended in 1939. So yes, the Great Depression was caused by instability of America's financial house.