Which of the following best explains why we traditionally categorize the world according to the eastern and western hemispheres?
a. the lines of trade formed east to west.
b. global religions were divided from east to west.
c. early geographers initially divided from east to west.
d. the main oceans divide the continents from east to west.

The answer is to the question is A. The world is divided into the  Eastern and Western hemispheres  by an imaginary line that divides the earth equally from the poles. Generally, all of Asia, Africa, Oceania and most of Europe comprise of the Eastern hemisphere. In the western hemisphere, we have North America, South America, Caribbean Islands, Central America and also Greenland. The oceans are in both hemispheres leading to the lines being the basis of the division of the two hemispheres.