According to the Text, the Principal Cause of the Housing

According to the text, the principal cause of the housing crisis in the first decade of the twenty-first century was

A) too much government regulation.
B) a severe drop in the stock market.
C) the government's refusal to bail out Lehman Brothers.
D) mortgage lenders peddling risky mortgages.
E) President George W. Bush's firing of the chair of the Federal Reserve.