No links
In terms of ethnicity, both Korea and Japan

A tend to be culturally and racially heterogeneous,tend to be culturally and racially heterogeneous,
B are dominated by one major ethnic group.are dominated by one major ethnic group.
C have no ethnic controversies.have no ethnic controversies.

D have limited the influence of ethnic groups.have limited the influence of ethnic groups.
E are made up of many ethnicity.