One of the Reasons That Channels of Distribution Often Pose

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

A) if key individual of middlemen firms retires,the company may lose its distribution
B) most middlemen do not maintain sufficient inventory to serve customers
C) most middlemen tend to slow down distribution to extract higher commissions
D) some middlemen lack product knowledge resulting in low sales volume
E) none of the above