In Many Instances, Customer Attrition; the Loss of Customers Over

In many instances, customer attrition; the loss of customers over time, is not controllable because of all the following reasons, EXCEPT?

A) The customers may believe a competitor's services create more value
B) Some customers may literally go out of business
C) The customers may merge or be acquired
D) The customers feels that the salesperson is not responding to their calls
E) Certain customers may no longer need the salesperson's services due to change of business