One of the Reasons That Channels of Distribution Often Pose

One of the reasons that channels of distribution often pose longevity problems is that ____.

A) most middlemen do not maintain sufficient inventory to serve customers
B) some middlemen lack product knowledge resulting in low sales volume
C) most middlemen have little loyalty to their vendors
D) most middlemen tend to slow down distribution to extract higher commissions
E) most middlemen do not have sufficient knowledge of the target market