Tylenol and Advil Are Two Manufacturers of Over-The-Counter Products for Ailments

Tylenol and Advil are two manufacturers of over-the-counter products for ailments such as colds,headaches,sore throats,arthritis aches,and general pain and fever.Both manufacturers seek distribution of their products through pharmacies such as Walgreens.These companies seek out channels and intermediaries that will satisfy a buyer's desire for

A) variety.
B) information.
C) pre-or postsale service.
D) convenience.
E) adaptability.