finance question: Which one of the following statements related to market crashes is correct?

A. The market crash of 1987 occurred on a day when trading volume was light indicating there were a limited number of irrational investors involved.

B. A severe market decline tends to occur over a multi-day period.

C. Financial market crashes are unique to the United States.

D. Once the market finally crashed in 1929, stock prices began to slowly increase again.

E. Actions in Washington, D.C. may have helped contribute to the market crash in 1929 but not to the 1987 crash.