How did the u. s. stock market contribute to economic instability before the great depression?

a. many people took out risky loans that could only be repaid if stock prices continued to rise.
b. business owners were forced to pay huge fees to have their companies listed on the stock market.
c. stock traders were extremely cautious about investing in companies that relied on new technology.
d. the u. s. government required that all government employees shift their savings into stocks.