Peace ended in Bosnia when:foreign aid ended Communism ended the Berlin Wall was built

The correct answer is: "Communism ended":

The war originated during the time of the fall of Communism. The Socialist Republic of Yugoslavia was dissolved in 1991. This led to the creation of the countries of Croatia and Serbia. Bosnia was still part of Yugoslavia. It was a multiethnic country formed by Muslims Bosniaks (44%), Serbs (32.5%), and Croats (17%).

Bosnia passed a referendum for independence on February 29, 1992. However, the process was rejected by the Bosnian Serbs, who decided to boycott it. This led to an internal conflict between Bosnia and Herzegovina and the Croat and Serb side of the country,