Which historical event explains the large number of refugees to the United States arriving from Bosnia-Herzegovina, Serbia, and Montenegro from 1999 to 2001? A. unstable governments struggling with coastal piracy, militia groups, feuding warlords, and crumbling economies B. widespread famine caused by drought C. the break-up of Yugoslavia into smaller independent nations D. the break-up of the Soviet Union into smaller independent nations Please select the best answer from the choices provided.