题目内容：
As far as distribution is concerned, __________.
A．A wholesalers and retailers, although uncontrollable, are responsible for the selection of trade channels and development of distribution system B．B the marketing executive has great freedom in selecting trade channels and developing distribution system in spite of the presence of some uncontrollable factors
C．C the marketing executive is free from the control of wholesalers and retailers
D．D the marketing executive works with wholesalers and retailers with great consideratrion of position
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