1 Given the economic and political unrest, the family decided to emigrate.
2 Ruling brutally, the harsh dictator caused many people to flee the country.
3 Increasing tensions required that international diplomats begin to negotiate.
4 Some editorials exposing government corruption were leaked to the public.
If I recall correctly, it would be 4. "To the public." As a modifying phrase, it not only explains the action, it also adds more details (it tells the reader who the editorials were leaked to.) Hope this helps!
