The Global Recession Began in 2008 with A(n)

The global recession began in 2008 with a(n) :

A) "Toxic" mortgage crisis that snowballed into a general credit crisis.
B) Contested US presidential election in which the Electoral College results differed from the popular electoral tally.
C) Immigration crisis, as refugees fleeing the Arab Spring crowded into southern Europe.
D) Precipitous increase in the global inflation rate.