What do the countries allied against france have in common

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.

The date a source was created is considered part of its historical context intended audience purpose point of view

What did roosevelt believe was a common cause of both bank runs and the great depression?