how did competition between investors in the stock market lead to the day known as “black tuesday”?

a - the price of stocks went up as investors hurried to buy as many stocks as possible.

b - as selling started to increase, government regulators shut down trading for the first time in history.

c - more stocks were sold by investors that day than any other, driving the value of stocks down.

d - working together, investors were able to control the price of stocks through organized trading.