Answer:
E) The buying center may involve informal participants who are not obvious to sellers.
Explanation:
Buying center can be regarded as a
decision-making unit that is responsible for how some members of an organization that are partaking in buying process of a particular product/services come together. They are groups of people that are involved in purchasing decisions making in an organization, and they can be regarded as professional buyers. This concept came to light by Robinson and Farris
It should be noted that buying center may involve informal participants who are not obvious to sellers.