Which of the Following Is a Reason for Nonparticipation in Trade

Which of the following is a reason for nonparticipation in trade shows?

A) It is difficult for the firm to choose the appropriate trade fairs for participation.
B) Exporters are able to reach a sizable number of sales prospects but over an extensive time period.
C) Exporters are able to reach a sizable number of sales prospects but at very high costs per contact.
D) They are an expensive way of obtaining evaluative data on the effectiveness of a promotional campaign.