What Event Spurred the Final Downfall of the U

Multiple Choice

What event spurred the final downfall of the U.S. economy in 2008 when world trade experienced its deepest decline in more than 50 years?

A) The stock market ended at a record high.
B) The U.S. and Cuba joined forces.
C) The Senate and House failed to compromise on interest rates.
D) The housing market collapsed.
E) The voters elected a third-party candidate.