What are the most common used Geographic what are the most common uses of geographers

Which scenario best illustrates the principle of popular sovereignty?

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.

How was george washington able to defeat the british in the battle of trenton and princeton