What was one major cause of the Great Depression?

A) Banks lent more money than they had and made risky investments on Wall Street.

B) Governments forced banks to only lend out what they had on hand, freezing credit markets.

C) The United States had paid a tremendous economic cost for World War I, and couldn't pay its war debts.

D) Workers were being paid too much, and many businesses couldn't afford to employ them.