Which of the Following Contributed Most to the Economic Crisis

Multiple Choice

Which of the following contributed most to the economic crisis that began in 2007?

A) Deregulated commercial banks were allowed to take more risks than investment banks.
B) Deregulated commercial banks were allowed to trade securities and take more risks than they had been in the past.
C) Deregulated investment banks were allowed to trade securities and take more risks than they had been in the past.
D) Deregulated investment banks were allowed to take more risks than commercial banks.