The map below shows the ethnic groups in the southern Balkans in the 1900s. A map titled Ethnic Groups in Southern Balkans, 1900's. It shows the following groups are represented in different areas of the southern Balkans: Serbs, Macedonians, Albanians, Greeks, Turks, Romanians.

What does the information on this map suggest regarding ethnic groups in the southern Balkans?

The Balkan Peninsula’s ethnic variety will eventually cause a war.
The Balkan Peninsula’s largest ethnic group is the Macedonians.
The Balkan Peninsula is home to one ethnic group.
The Balkan Peninsula is the home of a wide variety of ethnic groups.