A Producer Has a Few Territories Where Many Big Customers

A producer has a few territories where many big customers are concentrated, but most of its target customers are spread all over the country.

A) The company should use manufacturers' agents in the best territories and sales branches in the others, since good agents won't work the smaller territories.
B) The company should use sales branches everywhere, since it will cost more to use manufacturers' agents.
C) The company will probably have to rely only on manufacturers' agents, since they will only be willing to take the widely scattered markets if they can have the good territories too.
D) The company should use sales branches in the concentrated territories and manufacturers' agents in the others--assuming the concentrated territories are large enough to support sales branches.
E) All of the above are good alternatives.