What Major Factor(s)led to the U

Multiple Choice

What major factor(s) led to the U.S.economic woes which started in 2007?

A) U.S.overseas military engagements.
B) A decline in real estate values which resulted in increased mortgage defaults and foreclosures and a decline in financial markets.
C) The European economic crisis.
D) Inflation and manufacturing outsourcing.
E) None of the above.