All of the Following Sources Produce Channel Conflict Except Which

All of the following sources produce channel conflict except which?

A) A manufacturer increases its distribution coverage in a geographical area.
B) A channel member bypasses another member and sells or buys products directly.
C) Disagreements over how profit margins are distributed among channel members.
D) Manufacturers believe wholesalers or retailers are not giving their products adequate attention.
E) A channel member wants to use vendor-managed inventory.