AP Human Geography

Answer - D - Caucasus has the greatest linguistic fragmentation.

Key Takeaway: The lower parts of the Caucasus Mountains are situated in the Greater Middle East. The Caucasus Mountains are generally considered to be a dividing line between Asia and Europe, and territories in Caucasia are alternately considered to be in one or both continents. As the Earth’s geographic population center, the Caucasus is one of the most linguistically and culturally diverse regions on Earth, leading to a great deal of linguistic fragmentation among its people and cultures.