HELP Which sentence best completes the diagram

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.

Which number shows the location of the united kingdom of great britain?

During the late 1800s, most immigrants to the united states came from a. northern europe b. eastern europe c. asia d. mexico