A catalog retailer studies about? 3,500 variables over the lifetime of a? customer's relationship. It has found that customers who are? single, between the ages of 22 and? 35, and have no children are its least profitable customer segment. By severely reducing the number of communications and promotional offers sent to this? segment, this catalog retailer has engaged in? ________.
A. customer abandonment
B. customer retention
C. customer acquisition
D. market basket analysis
E. churn rate