When bosnian serbs practiced ethnic cleansing of the muslim population during the 1990s, they employed a combination of

The answer that fits the blank is POPULATION TRANSFER AND GENOCIDE. Population transfer is the movement of a large group of people to another place or region, in short, they are forcefully migrated. Genocide is the term given to the massive killing of a group of people. These are their ways that Bosnian Serbs cleansed their Muslim population.

The answer is protestant reformation.