A Main Difference of U

A main difference of U.S. financial crisis in year 2008-09 from crises in emerging market economies such as Mexico is that:

A) U.S. financial crisis have not resulted in substantial bank failures.
B) U.S. financial crisis tend to be of shorter duration.
C) speculative currency attacks have not played a dominant role in U.S. financial crisis.
D) U.S. authorities have not permitted insolvent financial institutions to stay in operation.