When Hansine Visits the BMG Website, the Marketer Tracked the Pages

When Hansine visits the BMG website, the marketer tracked the pages she visited, the amount of time she spent on each page, and the CDs she purchased. It then grouped visitors with similar patterns. On subsequent visits, Hansine and visitors who had displayed similar behavior to hers will be steered to merchandise they are most likely to buy. This is called:

A) market augmenting.
B) research segmentation.
C) grouping.
D) market congregating.
E) clustering.