In the Nineteenth Century, Which Global Region Was Clearly the Dominant

In the nineteenth century, which global region was clearly the dominant factor in world political and military developments?

A) The West, as in Western Europe and the United States.
B) The area of Africa below the Sahara Desert.
C) The major Asian countries like China and Japan.
D) South America, especially the areas around the Amazon River.
E) The Astralasian island chains that provide fish and rice.