Which statement identifies a major cause of the Great Recession?

Overproduction led companies to declare bankruptcy for unsold goods.
Many unsuitable borrowers defaulted on risky home loans.
Many unsuitable borrowers defaulted on risky home loans.
Many Americans went bankrupt through buying stocks on credit.

How would europe benefit economically from greater unity

Following archduke franz ferdinand's assassination, austro-hungarian leaders: a. aided the ottoman empire in its campaign to keep serbia under its control. b. executed nearly all prominent serbs living in austria-hungary c. threatened to invade serbia if serb leaders did not agree to a set of strict demands. d.. formed an alliance with great britain to protect austria-hungary from future attacks.

Who did the first work in creating vaccines