The genocides in both cambodia and bosnia are examples of
a holocaust.
the holodomor.
ethnic cleansing.
religious cleansing.

The Holocaust and Holodomor were other specific genocides, not types of genocides or killings.

the genocide in Cambodia was not an ethnic cleansing, as the ethnicity of the victims and perpetrators was the same. The correct asnwer is then the last: religious cleansing, as the conflicts were in both cases on religious ground.