One of the Major Problems That Is Dampening the Effect

One of the major problems that is dampening the effect of international trade shows is:

A) they are becoming too expensive to attend.
B) they are not as productive as they once were with respect to marketing.
C) governments are now putting pressure on companies to stay away from certain trade shows as an extension of foreign policy.
D) the wrong type of customers are beginning to dominate trade shows.
E) many buyers are becoming less enthusiastic about buying as a result of attending a trade show.