Answer:
People were affected by the crash because:
D. Banks had invested, which lost most of their money.
Explanation:
The stock market crash did not affect only those who had invested in the market. It also affected people who, at a first glance, seemed to have no direct connection with it whatsoever. First, we must remember that there were businesses which invested and depended on the market. If those businesses were affected, then the people who worked for them were also affected. Second, what many people do not realize is that banks use their customers' money to invest in the market. Thus, people who had never invested on their own lost all their money because their bank had used it for investments.
