Genocides and forced population transfer are considered to be both types of ethnic cleansing. Thus, the correct answer is D.
Ethnic cleansing is referred to as the forcible transfer or removal of people belonging to particular ethnic groups in order to create racially similar geographic areas.
In this population of relocated Bosnian refugees, ethnic cleansing has appeared in a high incidence of Trauma, mental disorder, depression, and other forms of psychological illness.
Therefore, option D, ethnic cleansing is the appropriate answer.
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