In the Context of Territory Routing Plans, a Circular Routing

In the context of territory routing plans, a circular routing plan is best used when:

A) accounts are evenly dispersed throughout the territory.
B) accounts are concentrated in different parts of the territory.
C) accounts are located in linear clusters that are some distance from one another.
D) accounts are held in major metropolitan areas.
E) accounts are highly concentrated with locations controlled by a grid of city blocks.