The correct answer would be alternative C) "The hysteria of last Thursday had passed as quickly as it developed."
This statement is related to the Great Depression of 1929, which was the worst economic crisis the United States has ever faced.
Alternatives A and B seem to show people dealing with the situation as if it were only another day in the office, talking about "putting the house in order" , and as if it were simple, and easy to demonstrate and understand with reports and graphs.
Alternative C best describes it as a hysteria, people being desperate and treatin it as an anomaly.