During the 2008 Great Financial Crisis the S&P 500 fell cumulatively by about 50%.

Use the S&P 500 peak-to-trough decline during the Great Financial Crisis (Oct 2007 peak about 1,565 to the March 2009 trough about 677 close or 667 intraday). True: the decline is about 45–58%. Mostly true: it is 40–45% or 58–62%. Mostly false: it is 30–40% or above 62%. False: it is below 30%.

Set before the research began.

1. E1 Notes from the Vault: Stock Prices in the Financial Crisis Federal Reserve Bank of Atlanta, Center for Financial Innovation and Stability (author: Gerald P. Dwyer) · September 2009

   “This index fell even more— 56.8 percent from its peak on October 9, 2007, to a low point on March 9, 2009.”

2. E2 The Great Recession Federal Reserve History · 22 November 2013

   “while the S&P 500 index fell 57 percent from its October 2007 peak to its trough in March 2009.”

3. E3 Notes from the Vault: Stock Prices in the Financial Crisis Federal Reserve Bank of Atlanta, Center for Financial Innovation and Stability (author: Gerald P. Dwyer) · September 2009

   “Stock prices fell roughly 50 percent from peak to trough from October 2007 to March 2009.”

E1 says the index fell 56.8 percent from its October 9, 2007 peak to a low on March 9, 2009. E2 (Federal Reserve History) gives the S&P 500's decline from the October 2007 peak to the March 2009 trough as 57 percent. E3 says stock prices fell roughly 50 percent from peak to trough over the same period. The S&P 500 decline of 57 percent given in E2 falls inside the 45–58% band the criteria set for true; E1 gives 56.8 percent for an index and E3 gives roughly 50 percent for stock prices over the same period.