The correct answer is A) Serbian leader Milosevic's effort to remove Bosniaks.
What accounted for ethnic cleansing in the Balkans during the 1990s was the Serbian leader Milosevic's effort to remove Bosniaks.
Serbian leader Milosevic's tried to get rid of Bosnians through killing or deportation. When Bosnia-Herzegovina got its independence from Yugoslavia in 1992, Bosnian Serbs killed thousands of Bosnian Muslims and deporter many others. In July 1995, the Serbs assassinated 8000 Bosniak people and the immediate reaction of the international community through the United Nations was to condemn the brutal attack. President Clinton sent US troops to control the situation and avoid the risk of another war in Europe.