According to the Text,one of the Most Effective Ways of Monitoring

According to the text,one of the most effective ways of monitoring the results experienced by channel members in the use of a logistics program is:

A) To use the grapevine.
B) To rely solely on the sales force.
C) To conduct a survey of a sample of channel members.
D) To perform a sales analysis.
E) Analyze orders that are placed by channel members.