The correct answer to this open question is the following.
Although there are no options attached we can say the following.
What were stockbrokers busy doing on Sunday, October 27, 1929?
Answer:
Stockbrokers were busy putting orders in their books and trying to catch up on clerical work.
This was previously the "Black Tuesday" of October 29, 1929. On this day the United States stock market crashed. After the crash, millions of American people lost their jobs, companies closed, and banks broke. It was the beginning of the US Great Depression, the worst economic crisis in the history of the United States. It was a time of much suffering for the citizens who did not receive any help from the federal government.