Which statement is false?

A) Had the stock market not crashed and the rest of the world not gone into a depression,the U.S.depression might have been avoided.
B) By the end of 1930 thousands of banks had failed.
C) By the first week in March 1933 every single bank in the United States had shut its doors.
D) None of the statements are false.

All the statements provided reflect historical facts or plausible scenarios related to the Great Depression. Statement A discusses a hypothetical situation that is widely debated among historians. Statement B is accurate, as thousands of banks did fail by the end of 1930 due to the stock market crash of 1929 and subsequent economic downturn. Statement C is also true, as by early March 1933, a banking panic had led to the closure of all banks in the United States, prompting President Franklin D. Roosevelt to declare a national "bank holiday" to prevent further runs on banks. Therefore, none of the statements are false.